CVE-2026-78223

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The <code>jti</code>, <code>exp</code> and <code>sub</code> claims it returns are written straight onto the revocation record, guarded only by <code>byte_size(token) &gt; 0</code>. Because <code>expires_at</code> derives from the attacker-chosen <code>exp</code>, a forged copy of a genuine token that keeps the real <code>jti</code> but backdates <code>exp</code> yields a revocation row that is already expired: <code>expunge_expired</code> removes it and the genuine token passes <code>revoked?</code> again. Arbitrary <code>jti</code> and <code>sub</code> values can be inserted the same way.</p>\n<p>This issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.</p>"}, {"base64": false, "type": "text/markdown", "value": "Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthentication allows a caller of the token revocation action to neutralise a revocation or write arbitrary rows into the token resource.\n\n`AshAuthentication.TokenResource.RevokeTokenChange.change/3` reads the `:token` argument and decodes it with `AshAuthentication.Jwt.peek/1`, which delegates to `Joken.peek_claims/1` and performs no signature check, unlike `Jwt.verify/4`. The `jti`, `exp` and `sub` claims it returns are written straight onto the revocation record, guarded only by `byte_size(token) > 0`. Because `expires_at` derives from the attacker-chosen `exp`, a forged copy of a genuine token that keeps the real `jti` but backdates `exp` yields a revocation row that is already expired: `expunge_expired` removes it and the genuine token passes `revoked?` again. Arbitrary `jti` and `sub` values can be inserted the same way.\n\nThis issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14."}], "value": "Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthentication allows a caller of the token revocation action to neutralise a revocation or write arbitrary rows into the token resource.\n\nAshAuthentication.TokenResource.RevokeTokenChange.change/3 reads the :token argument and decodes it with AshAuthentication.Jwt.peek/1, which delegates to Joken.peek_claims/1 and performs no signature check, unlike Jwt.verify/4. The jti, exp and sub claims it returns are written straight onto the revocation record, guarded only by byte_size(token) > 0. Because expires_at derives from the attacker-chosen exp, a forged copy of a genuine token that keeps the real jti but backdates exp yields a revocation row that is already expired: expunge_expired removes it and the genuine token passes revoked? again. Arbitrary jti and sub values can be inserted the same way.\n\nThis issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14."}], "impacts": [{"capecId": "CAPEC-475", "descriptions": [{"lang": "en", "value": "CAPEC-475 Signature Spoofing by Improper Validation"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 6.9, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-347", "description": "CWE-347 Improper Verification of Cryptographic Signature", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-17T13:09:19.591Z"}, "references": [{"tags": ["related", "vendor-advisory"], "url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-mfwg-5cpf-px58"}, {"name": "EEF CNA record for CVE-2026-78223", "tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-78223.html"}, {"name": "OSV record EEF-CVE-2026-78223", "tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-78223"}, {"name": "Introducing commit a939dde in team-alembic/ash_authentication", "tags": ["related"], "url": "https://github.com/team-alembic/ash_authentication/commit/a939dde9b917c072cdf10c4b0913a9886a4b0231"}, {"name": "Fix commit 344cebb in team-alembic/ash_authentication", "tags": ["patch"], "url": "https://github.com/team-alembic/ash_authentication/commit/344cebb12faf68e648d3283394073ba0c0f78459"}, {"name": "Fix commit eb86353 in team-alembic/ash_authentication", "tags": ["patch"], "url": "https://github.com/team-alembic/ash_authentication/commit/eb86353fe5a547c5ff5fd9af0e2c212518c31c9b"}], "source": {"discovery": "INTERNAL"}, "title": "Token revocation record built from unverified JWT claims in AshAuthentication"}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-17T18:28:12.763636Z", "id": "CVE-2026-78223", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-09-17T18:28:20.821Z"}}]}}

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["'Elixir.AshAuthentication.TokenResource.RevokeTokenChange'"], "product": "ash_authentication", "versions": [{"status": "affected", "version": "0.2.0", "lessThan": "4.15.0", "versionType": "semver"}, {"status": "affected", "version": "5.0.0-rc.0", "lessThan": "5.0.0-rc.14", "versionType": "semver"}], "packageURL": "pkg:hex/ash_authentication", "packageName": "ash_authentication", "programFiles": ["lib/ash_authentication/token_resource/revoke_token_change.ex"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.AshAuthentication.TokenResource.RevokeTokenChange':change/3"}]}, {"cpes": ["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"], "repo": "https://github.com/team-alembic/ash_authentication", "vendor": "team-alembic", "modules": ["'Elixir.AshAuthentication.TokenResource.RevokeTokenChange'"], "product": "ash_authentication", "versions": [{"status": "affected", "changes": [{"at": "344cebb12faf68e648d3283394073ba0c0f78459", "status": "unaffected"}, {"at": "eb86353fe5a547c5ff5fd9af0e2c212518c31c9b", "status": "unaffected"}], "version": "a939dde9b917c072cdf10c4b0913a9886a4b0231", "lessThan": "*", "versionType": "git"}], "packageURL": "pkg:github/team-alembic/ash_authentication", "packageName": "team-alembic/ash_authentication", "programFiles": ["lib/ash_authentication/token_resource/revoke_token_change.ex"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.AshAuthentication.TokenResource.RevokeTokenChange':change/3"}]}], "references": [{"url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-mfwg-5cpf-px58", "tags": ["related", "vendor-advisory"]}, {"url": "https://cna.erlef.org/cves/CVE-2026-78223.html", "name": "EEF CNA record for CVE-2026-78223", "tags": ["related"]}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-78223", "name": "OSV record EEF-CVE-2026-78223", "tags": ["related"]}, {"url": "https://github.com/team-alembic/ash_authentication/commit/a939dde9b917c072cdf10c4b0913a9886a4b0231", "name": "Introducing commit a939dde in team-alembic/ash_authentication", "tags": ["related"]}, {"url": "https://github.com/team-alembic/ash_authentication/commit/344cebb12faf68e648d3283394073ba0c0f78459", "name": "Fix commit 344cebb in team-alembic/ash_authentication", "tags": ["patch"]}, {"url": "https://github.com/team-alembic/ash_authentication/commit/eb86353fe5a547c5ff5fd9af0e2c212518c31c9b", "name": "Fix commit eb86353 in team-alembic/ash_authentication", "tags": ["patch"]}], "dateAssigned": "2026-09-11T18:31:49.000Z", "descriptions": [{"lang": "en", "value": "Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthentication allows a caller of the token revocation action to neutralise a revocation or write arbitrary rows into the token resource.\n\nAshAuthentication.TokenResource.RevokeTokenChange.change/3 reads the :token argument and decodes it with AshAuthentication.Jwt.peek/1, which delegates to Joken.peek_claims/1 and performs no signature check, unlike Jwt.verify/4. The jti, exp and sub claims it returns are written straight onto the revocation record, guarded only by byte_size(token) > 0. Because expires_at derives from the attacker-chosen exp, a forged copy of a genuine token that keeps the real jti but backdates exp yields a revocation row that is already expired: expunge_expired removes it and the genuine token passes revoked? again. Arbitrary jti and sub values can be inserted the same way.\n\nThis issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.", "supportingMedia": [{"type": "text/html", "value": "<p>Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthentication allows a caller of the token revocation action to neutralise a revocation or write arbitrary rows into the token resource.</p>\n<p><code>AshAuthentication.TokenResource.RevokeTokenChange.change/3</code> reads the <code>:token</code> argument and decodes it with <code>AshAuthentication.Jwt.peek/1</code>, which delegates to <code>Joken.peek_claims/1</code> and performs no signature check, unlike <code>Jwt.verify/4</code>. The <code>jti</code>, <code>exp</code> and <code>sub</code> claims it returns are written straight onto the revocation record, guarded only by <code>byte_size(token) &gt; 0</code>. Because <code>expires_at</code> derives from the attacker-chosen <code>exp</code>, a forged copy of a genuine token that keeps the real <code>jti</code> but backdates <code>exp</code> yields a revocation row that is already expired: <code>expunge_expired</code> removes it and the genuine token passes <code>revoked?</code> again. Arbitrary <code>jti</code> and <code>sub</code> values can be inserted the same way.</p>\n<p>This issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.</p>", "base64": false}, {"type": "text/markdown", "value": "Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthentication allows a caller of the token revocation action to neutralise a revocation or write arbitrary rows into the token resource.\n\n`AshAuthentication.TokenResource.RevokeTokenChange.change/3` reads the `:token` argument and decodes it with `AshAuthentication.Jwt.peek/1`, which delegates to `Joken.peek_claims/1` and performs no signature check, unlike `Jwt.verify/4`. The `jti`, `exp` and `sub` claims it returns are written straight onto the revocation record, guarded only by `byte_size(token) > 0`. Because `expires_at` derives from the attacker-chosen `exp`, a forged copy of a genuine token that keeps the real `jti` but backdates `exp` yields a revocation row that is already expired: `expunge_expired` removes it and the genuine token passes `revoked?` again. Arbitrary `jti` and `sub` values can be inserted the same way.\n\nThis issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-347", "description": "CWE-347 Improper Verification of Cryptographic Signature"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.15.0", "versionStartIncluding": "0.2.0"}, {"criteria": "cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.0.0-rc.14", "versionStartIncluding": "5.0.0-rc.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-17T13:09:19.591Z"}}}, "cveMetadata": {"cveId": "CVE-2026-78223", "state": "PUBLISHED", "dateUpdated": "2026-09-17T18:28:20.821Z", "dateReserved": "2026-09-11T18:30:01.328Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-09-17T13:09:19.591Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshAuthentication.TokenResource.RevokeTokenChange'"], "packageName": "ash_authentication", "packageURL": "pkg:hex/ash_authentication", "product": "ash_authentication", "programFiles": ["lib/ash_authentication/token_resource/revoke_token_change.ex"], "programRoutines": [{"name": "'Elixir.AshAuthentication.TokenResource.RevokeTokenChange':change/3"}], "repo": "https://github.com/team-alembic/ash_authentication", "vendor": "team-alembic", "versions": [{"lessThan": "4.15.0", "status": "affected", "version": "0.2.0", "versionType": "semver"}, {"lessThan": "5.0.0-rc.14", "status": "affected", "version": "5.0.0-rc.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.AshAuthentication.TokenResource.RevokeTokenChange'"], "packageName": "team-alembic/ash_authentication", "packageURL": "pkg:github/team-alembic/ash_authentication", "product": "ash_authentication", "programFiles": ["lib/ash_authentication/token_resource/revoke_token_change.ex"], "programRoutines": [{"name": "'Elixir.AshAuthentication.TokenResource.RevokeTokenChange':change/3"}], "repo": "https://github.com/team-alembic/ash_authentication", "vendor": "team-alembic", "versions": [{"changes": [{"at": "344cebb12faf68e648d3283394073ba0c0f78459", "status": "unaffected"}, {"at": "eb86353fe5a547c5ff5fd9af0e2c212518c31c9b", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "a939dde9b917c072cdf10c4b0913a9886a4b0231", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthentication allows a caller of the token revocation action to neutralise a revocation or write arbitrary rows into the token resource.\n\nAshAuthentication.TokenResource.RevokeTokenChange.change/3 reads the :token argument and decodes it with AshAuthentication.Jwt.peek/1, which delegates to Joken.peek_claims/1 and performs no signature check, unlike Jwt.verify/4. The jti, exp and sub claims it returns are written straight onto the revocation record, guarded only by byte_size(token) > 0. Because expires_at derives from the attacker-chosen exp, a forged copy of a genuine token that keeps the real jti but backdates exp yields a revocation row that is already expired: expunge_expired removes it and the genuine token passes revoked? again. Arbitrary jti and sub values can be inserted the same way.\n\nThis issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14."}], "id": "CVE-2026-78223", "lastModified": "2026-09-18T18:16:18.527", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-78223", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-17T18:28:12.763636Z", "version": "2.0.3"}}]}, "published": "2026-09-17T14:17:29.987", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-78223.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/team-alembic/ash_authentication/commit/344cebb12faf68e648d3283394073ba0c0f78459"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/team-alembic/ash_authentication/commit/a939dde9b917c072cdf10c4b0913a9886a4b0231"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/team-alembic/ash_authentication/commit/eb86353fe5a547c5ff5fd9af0e2c212518c31c9b"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-mfwg-5cpf-px58"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-78223"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.2.0,4.15.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0-rc.0,5.0.0-rc.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a939dde9b917c072cdf10c4b0913a9886a4b0231,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "ash_authentication", "vendor": "team-alembic"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.2.0,4.15.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0-rc.0,5.0.0-rc.14)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "ash_authentication", "source": "cna", "vendor": "team-alembic"}, "product": "ash_authentication", "vendor": "team-alembic"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a939dde9b917c072cdf10c4b0913a9886a4b0231,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "ash_authentication", "source": "cna", "vendor": "team-alembic"}, "product": "ash_authentication", "vendor": "team-alembic"}], "created": "2026-09-17T22:30:17.005052+00:00", "updated": "2026-09-18T00:30:16.815596+00:00", "vendors": ["team-alembic", "team-alembic$PRODUCT$ash_authentication"]}