CVE-2026-66885

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66885", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-07-28T04:15:10.240Z", "datePublished": "2026-08-05T19:44:23.834Z", "dateUpdated": "2026-11-10T17:25:33.237Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "packageName": "livebook", "packageURL": "pkg:hex/livebook", "product": "livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}], "repo": "https://github.com/livebook-dev/livebook", "vendor": "livebook-dev", "versions": [{"lessThan": "0.18.7", "status": "affected", "version": "0.15.0", "versionType": "semver"}, {"lessThan": "0.19.9", "status": "affected", "version": "0.19.0", "versionType": "semver"}]}, {"collectionURL": "https://ghcr.io", "cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "packageName": "livebook-dev/livebook", "packageURL": "pkg:oci/livebook?repository_url=ghcr.io%2Flivebook-dev%2Flivebook", "product": "livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}], "vendor": "livebook-dev", "versions": [{"lessThan": "0.18.7", "status": "affected", "version": "0.15.0", "versionType": "other"}, {"lessThan": "0.18.7-cuda12", "status": "affected", "version": "0.15.0-cuda12", "versionType": "other"}, {"lessThan": "0.19.9", "status": "affected", "version": "0.19.0", "versionType": "other"}, {"lessThan": "0.19.9-cuda12", "status": "affected", "version": "0.19.0-cuda12", "versionType": "other"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "packageName": "livebook-dev/livebook", "packageURL": "pkg:github/livebook-dev/livebook", "product": "livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}], "repo": "https://github.com/livebook-dev/livebook", "vendor": "livebook-dev", "versions": [{"changes": [{"at": "21c16168263275541a6e076d0c31852c40e09a18", "status": "unaffected"}, {"at": "33a052daa386c4ce08a9c39a07fc90f353ff6a51", "status": "unaffected"}, {"at": "6ed2e213e9d5a19a70d7fcad5a8d616622cd2084", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "4380a411920531223088267ed1c0ad21f96ef660", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.18.7", "versionStartIncluding": "0.15.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.19.9", "versionStartIncluding": "0.19.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Nguy\u1ec5n C\u00f4ng T\u00fa"}, {"lang": "en", "type": "remediation developer", "value": "Jonatan K\u0142osko"}, {"lang": "en", "type": "remediation reviewer", "value": "Jos\u00e9 Valim"}, {"lang": "en", "type": "remediation reviewer", "value": "Hugo Bara\u00fana"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.</p>\n<p>When Livebook is configured to use Livebook Teams for identity, <code>Livebook.ZTA.LivebookTeams.handle_request/4</code> in <code>lib/livebook/zta/livebook_teams.ex</code> handles the OAuth-style callback carrying a <code>teams_identity</code> marker and a <code>code</code> parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No <code>state</code> or nonce is generated when the flow is initiated: <code>Livebook.Teams.Requests.create_auth_request/1</code> in <code>lib/livebook/teams/requests.ex</code> sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.</p>\n<p>An attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.</p>\n<p>The consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.</p>\n<p>This issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9.</p>"}, {"base64": false, "type": "text/markdown", "value": "Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.\n\nWhen Livebook is configured to use Livebook Teams for identity, `Livebook.ZTA.LivebookTeams.handle_request/4` in `lib/livebook/zta/livebook_teams.ex` handles the OAuth-style callback carrying a `teams_identity` marker and a `code` parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No `state` or nonce is generated when the flow is initiated: `Livebook.Teams.Requests.create_auth_request/1` in `lib/livebook/teams/requests.ex` sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.\n\nAn attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.\n\nThe consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.\n\nThis issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9."}], "value": "Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.\n\nWhen Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handle_request/4 in lib/livebook/zta/livebook_teams.ex handles the OAuth-style callback carrying a teams_identity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.create_auth_request/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.\n\nAn attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.\n\nThe consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.\n\nThis issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9."}], "impacts": [{"capecId": "CAPEC-62", "descriptions": [{"lang": "en", "value": "CAPEC-62 Cross Site Request Forgery"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 6.8, "baseSeverity": "MEDIUM", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-352", "description": "CWE-352 Cross-Site Request Forgery", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-11-10T17:25:33.237Z"}, "references": [{"name": "Livebook Teams Identity OAuth-style callback has no state/nonce binding, enabling login CSRF", "tags": ["vendor-advisory", "related"], "url": "https://github.com/livebook-dev/livebook/security/advisories/GHSA-pvvw-28fw-c6fg"}, {"name": "EEF CNA record for CVE-2026-66885", "tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-66885.html"}, {"name": "OSV record EEF-CVE-2026-66885", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66885"}, {"name": "Introducing commit 4380a41 in livebook-dev/livebook", "tags": ["related"], "url": "https://github.com/livebook-dev/livebook/commit/4380a411920531223088267ed1c0ad21f96ef660"}, {"name": "Fix commit 21c1616 in livebook-dev/livebook", "tags": ["patch"], "url": "https://github.com/livebook-dev/livebook/commit/21c16168263275541a6e076d0c31852c40e09a18"}, {"name": "Fix commit 33a052d in livebook-dev/livebook", "tags": ["patch"], "url": "https://github.com/livebook-dev/livebook/commit/33a052daa386c4ce08a9c39a07fc90f353ff6a51"}, {"name": "Fix commit 6ed2e21 in livebook-dev/livebook", "tags": ["patch"], "url": "https://github.com/livebook-dev/livebook/commit/6ed2e213e9d5a19a70d7fcad5a8d616622cd2084"}], "source": {"discovery": "EXTERNAL"}, "title": "Livebook Teams identity callback lacks state binding, allowing login CSRF"}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-06T13:09:14.330707Z", "id": "CVE-2026-66885", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-06T13:09:29.359Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-66885", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-06T13:09:14.330707Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-06T13:09:22.979Z"}}], "cna": {"title": "Livebook Teams identity callback lacks state binding, allowing login CSRF", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Nguy\u1ec5n C\u00f4ng T\u00fa"}, {"lang": "en", "type": "remediation developer", "value": "Jonatan K\u0142osko"}, {"lang": "en", "type": "remediation reviewer", "value": "Jos\u00e9 Valim"}, {"lang": "en", "type": "remediation reviewer", "value": "Hugo Bara\u00fana"}], "impacts": [{"capecId": "CAPEC-62", "descriptions": [{"lang": "en", "value": "CAPEC-62 Cross Site Request Forgery"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.8, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "repo": "https://github.com/livebook-dev/livebook", "vendor": "livebook-dev", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "product": "livebook", "versions": [{"status": "affected", "version": "0.15.0", "lessThan": "0.18.7", "versionType": "semver"}, {"status": "affected", "version": "0.19.0", "lessThan": "0.19.9", "versionType": "semver"}], "packageURL": "pkg:hex/livebook", "packageName": "livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}]}, {"cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "vendor": "livebook-dev", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "product": "livebook", "versions": [{"status": "affected", "version": "0.15.0", "lessThan": "0.18.7", "versionType": "other"}, {"status": "affected", "version": "0.15.0-cuda12", "lessThan": "0.18.7-cuda12", "versionType": "other"}, {"status": "affected", "version": "0.19.0", "lessThan": "0.19.9", "versionType": "other"}, {"status": "affected", "version": "0.19.0-cuda12", "lessThan": "0.19.9-cuda12", "versionType": "other"}], "packageURL": "pkg:oci/livebook?repository_url=ghcr.io%2Flivebook-dev%2Flivebook", "packageName": "livebook-dev/livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "collectionURL": "https://ghcr.io", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}]}, {"cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "repo": "https://github.com/livebook-dev/livebook", "vendor": "livebook-dev", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "product": "livebook", "versions": [{"status": "affected", "changes": [{"at": "21c16168263275541a6e076d0c31852c40e09a18", "status": "unaffected"}, {"at": "33a052daa386c4ce08a9c39a07fc90f353ff6a51", "status": "unaffected"}, {"at": "6ed2e213e9d5a19a70d7fcad5a8d616622cd2084", "status": "unaffected"}], "version": "4380a411920531223088267ed1c0ad21f96ef660", "lessThan": "*", "versionType": "git"}], "packageURL": "pkg:github/livebook-dev/livebook", "packageName": "livebook-dev/livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}]}], "references": [{"url": "https://github.com/livebook-dev/livebook/security/advisories/GHSA-pvvw-28fw-c6fg", "name": "Livebook Teams Identity OAuth-style callback has no state/nonce binding, enabling login CSRF", "tags": ["vendor-advisory", "related"]}, {"url": "https://cna.erlef.org/cves/CVE-2026-66885.html", "name": "EEF CNA record for CVE-2026-66885", "tags": ["related"]}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-66885", "name": "OSV record EEF-CVE-2026-66885", "tags": ["related"]}, {"url": "https://github.com/livebook-dev/livebook/commit/4380a411920531223088267ed1c0ad21f96ef660", "name": "Introducing commit 4380a41 in livebook-dev/livebook", "tags": ["related"]}, {"url": "https://github.com/livebook-dev/livebook/commit/21c16168263275541a6e076d0c31852c40e09a18", "name": "Fix commit 21c1616 in livebook-dev/livebook", "tags": ["patch"]}, {"url": "https://github.com/livebook-dev/livebook/commit/33a052daa386c4ce08a9c39a07fc90f353ff6a51", "name": "Fix commit 33a052d in livebook-dev/livebook", "tags": ["patch"]}, {"url": "https://github.com/livebook-dev/livebook/commit/6ed2e213e9d5a19a70d7fcad5a8d616622cd2084", "name": "Fix commit 6ed2e21 in livebook-dev/livebook", "tags": ["patch"]}], "descriptions": [{"lang": "en", "value": "Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.\n\nWhen Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handle_request/4 in lib/livebook/zta/livebook_teams.ex handles the OAuth-style callback carrying a teams_identity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.create_auth_request/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.\n\nAn attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.\n\nThe consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.\n\nThis issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9.", "supportingMedia": [{"type": "text/html", "value": "<p>Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.</p>\n<p>When Livebook is configured to use Livebook Teams for identity, <code>Livebook.ZTA.LivebookTeams.handle_request/4</code> in <code>lib/livebook/zta/livebook_teams.ex</code> handles the OAuth-style callback carrying a <code>teams_identity</code> marker and a <code>code</code> parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No <code>state</code> or nonce is generated when the flow is initiated: <code>Livebook.Teams.Requests.create_auth_request/1</code> in <code>lib/livebook/teams/requests.ex</code> sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.</p>\n<p>An attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.</p>\n<p>The consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.</p>\n<p>This issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9.</p>", "base64": false}, {"type": "text/markdown", "value": "Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.\n\nWhen Livebook is configured to use Livebook Teams for identity, `Livebook.ZTA.LivebookTeams.handle_request/4` in `lib/livebook/zta/livebook_teams.ex` handles the OAuth-style callback carrying a `teams_identity` marker and a `code` parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No `state` or nonce is generated when the flow is initiated: `Livebook.Teams.Requests.create_auth_request/1` in `lib/livebook/teams/requests.ex` sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.\n\nAn attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.\n\nThe consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.\n\nThis issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-352", "description": "CWE-352 Cross-Site Request Forgery"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "0.18.7", "versionStartIncluding": "0.15.0"}, {"criteria": "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "0.19.9", "versionStartIncluding": "0.19.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-11-10T17:25:33.237Z"}}}, "cveMetadata": {"cveId": "CVE-2026-66885", "state": "PUBLISHED", "dateUpdated": "2026-11-10T17:25:33.237Z", "dateReserved": "2026-07-28T04:15:10.240Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-08-05T19:44:23.834Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "packageName": "livebook", "packageURL": "pkg:hex/livebook", "product": "livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}], "repo": "https://github.com/livebook-dev/livebook", "vendor": "livebook-dev", "versions": [{"lessThan": "0.18.7", "status": "affected", "version": "0.15.0", "versionType": "semver"}, {"lessThan": "0.19.9", "status": "affected", "version": "0.19.0", "versionType": "semver"}]}, {"collectionURL": "https://ghcr.io", "cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "packageName": "livebook-dev/livebook", "packageURL": "pkg:oci/livebook?repository_url=ghcr.io%2Flivebook-dev%2Flivebook", "product": "livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}], "vendor": "livebook-dev", "versions": [{"lessThan": "0.18.7", "status": "affected", "version": "0.15.0", "versionType": "other"}, {"lessThan": "0.18.7-cuda12", "status": "affected", "version": "0.15.0-cuda12", "versionType": "other"}, {"lessThan": "0.19.9", "status": "affected", "version": "0.19.0", "versionType": "other"}, {"lessThan": "0.19.9-cuda12", "status": "affected", "version": "0.19.0-cuda12", "versionType": "other"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.Livebook.ZTA.LivebookTeams", "Elixir.Livebook.Teams.Requests"], "packageName": "livebook-dev/livebook", "packageURL": "pkg:github/livebook-dev/livebook", "product": "livebook", "programFiles": ["lib/livebook/zta/livebook_teams.ex", "lib/livebook/teams/requests.ex"], "programRoutines": [{"name": "'Elixir.Livebook.ZTA.LivebookTeams':handle_request/4"}, {"name": "'Elixir.Livebook.Teams.Requests':create_auth_request/1"}], "repo": "https://github.com/livebook-dev/livebook", "vendor": "livebook-dev", "versions": [{"changes": [{"at": "21c16168263275541a6e076d0c31852c40e09a18", "status": "unaffected"}, {"at": "33a052daa386c4ce08a9c39a07fc90f353ff6a51", "status": "unaffected"}, {"at": "6ed2e213e9d5a19a70d7fcad5a8d616622cd2084", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "4380a411920531223088267ed1c0ad21f96ef660", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:livebook:livebook:*:*:*:*:*:*:*:*", "matchCriteriaId": "D2DF96B1-E7BE-4B24-9D03-1D53FEA54376", "versionEndExcluding": "0.18.7", "versionStartIncluding": "0.15.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:livebook:livebook:*:*:*:*:*:*:*:*", "matchCriteriaId": "7B4998A3-46BF-4E69-8642-1156BB3E7480", "versionEndExcluding": "0.19.9", "versionStartIncluding": "0.19.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity.\n\nWhen Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handle_request/4 in lib/livebook/zta/livebook_teams.ex handles the OAuth-style callback carrying a teams_identity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.create_auth_request/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.\n\nAn attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.\n\nThe consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.\n\nThis issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9."}, {"lang": "es", "value": "Una vulnerabilidad de falsificaci\u00f3n de petici\u00f3n en sitios cruzados (CSRF) en livebook-dev livebook permite a un atacante autenticar la sesi\u00f3n del navegador de una v\u00edctima bajo la propia identidad de Livebook Teams del atacante.\n\nCuando Livebook est\u00e1 configurado para usar Livebook Teams para la identidad, Livebook.ZTA.LivebookTeams.handle_request/4 en lib/livebook/zta/livebook_teams.ex maneja la devoluci\u00f3n de llamada de estilo OAuth que lleva un marcador teams_identity y un par\u00e1metro code. La cl\u00e1usula intercambia ese c\u00f3digo por un token de acceso y escribe el token en la sesi\u00f3n del navegador sin verificar ning\u00fan valor que vincule la devoluci\u00f3n de llamada a la sesi\u00f3n del navegador que inici\u00f3 el inicio de sesi\u00f3n. No se genera ning\u00fan estado o nonce cuando se inicia el flujo: Livebook.Teams.Requests.create_auth_request/1 en lib/livebook/teams/requests.ex env\u00eda un cuerpo de solicitud vac\u00edo, por lo que nunca se registra ning\u00fan valor por intento, y la cl\u00e1usula de devoluci\u00f3n de llamada no tiene nada con qu\u00e9 comparar.\n\nUn atacante que tiene membres\u00eda en la misma organizaci\u00f3n de Livebook Teams que la instancia objetivo puede, por lo tanto, iniciar el flujo de inicio de sesi\u00f3n ellos mismos, retener el c\u00f3digo de autorizaci\u00f3n resultante sin canjearlo, e inducir a una v\u00edctima a abrir una URL manipulada que contenga ese c\u00f3digo. El navegador de la v\u00edctima completa el intercambio y la sesi\u00f3n resultante se vincula a la identidad del atacante en lugar de la v\u00edctima. No se requiere que la v\u00edctima tenga ning\u00fan privilegio particular, y no se involucra ninguna credencial perteneciente a la v\u00edctima. La vulnerabilidad no permite al atacante autenticarse como la v\u00edctima.\n\nLa consecuencia es que un usuario cree que est\u00e1 trabajando en su propia sesi\u00f3n autenticada mientras que en realidad est\u00e1 operando como otra identidad. El trabajo realizado en esa sesi\u00f3n se atribuye a la cuenta del atacante, y los secretos, los datos cargados o los resultados del cuaderno que produce la v\u00edctima se exponen al atacante en lugar de mantenerse en la propia cuenta de la v\u00edctima. El c\u00f3digo de autorizaci\u00f3n debe canjearse dentro de un corto per\u00edodo despu\u00e9s de que comience el flujo de inicio de sesi\u00f3n, lo que restringe el momento del ataque pero no su viabilidad.\n\nEste problema afecta a livebook: desde 0.15.0 antes de 0.18.7 y desde 0.19.0 antes de 0.19.9."}], "id": "CVE-2026-66885", "lastModified": "2026-11-10T18:17:47.420", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-66885", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-06T13:09:14.330707Z", "version": "2.0.3"}}]}, "published": "2026-08-05T20:17:13.007", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Vendor Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-66885.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/livebook-dev/livebook/commit/21c16168263275541a6e076d0c31852c40e09a18"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/livebook-dev/livebook/commit/33a052daa386c4ce08a9c39a07fc90f353ff6a51"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/livebook-dev/livebook/commit/4380a411920531223088267ed1c0ad21f96ef660"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/livebook-dev/livebook/commit/6ed2e213e9d5a19a70d7fcad5a8d616622cd2084"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Vendor Advisory"], "url": "https://github.com/livebook-dev/livebook/security/advisories/GHSA-pvvw-28fw-c6fg"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66885"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-352"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

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