CVE-2026-53431

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53431", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-06-09T11:01:47.529Z", "datePublished": "2026-07-30T14:17:27.909Z", "dateUpdated": "2026-07-31T04:20:43.209Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:malach-it:boruta_auth:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Boruta.Oauth.Request.Base'", "'Elixir.Boruta.Oauth.Authorization.Client.Token'"], "packageName": "boruta", "packageURL": "pkg:hex/boruta", "product": "boruta", "programFiles": ["lib/boruta/oauth/request/base.ex", "lib/boruta/oauth/authorization/client.ex"], "programRoutines": [{"name": "'Elixir.Boruta.Oauth.Request.Base':fetch_client_authentication/1"}, {"name": "'Elixir.Boruta.Oauth.Request.Base':check_expiration/1"}, {"name": "'Elixir.Boruta.Oauth.Authorization.Client.Token':token_config/0"}], "repo": "https://github.com/malach-it/boruta_auth", "vendor": "malach-it", "versions": [{"lessThan": "2.3.7", "status": "affected", "version": "2.3.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:malach-it:boruta_auth:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Boruta.Oauth.Request.Base'", "'Elixir.Boruta.Oauth.Authorization.Client.Token'"], "packageName": "malach-it/boruta_auth", "packageURL": "pkg:github/malach-it/boruta_auth", "product": "boruta", "programFiles": ["lib/boruta/oauth/request/base.ex", "lib/boruta/oauth/authorization/client.ex"], "programRoutines": [{"name": "'Elixir.Boruta.Oauth.Request.Base':fetch_client_authentication/1"}, {"name": "'Elixir.Boruta.Oauth.Request.Base':check_expiration/1"}, {"name": "'Elixir.Boruta.Oauth.Authorization.Client.Token':token_config/0"}], "repo": "https://github.com/malach-it/boruta_auth", "vendor": "malach-it", "versions": [{"changes": [{"at": "5204f88f9b2cdd9637a755337ed5f99185be5474", "status": "unaffected"}, {"at": "69363432aa36760fc5438e4e17115d0f7c1b925a", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "5bfbe1c5443bffe71cf1bf954bbdff61327d9a83", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The attack requires that the Boruta deployment has provisioned at least one OAuth client configured to authenticate via JWT client assertions (<tt>client_secret_jwt</tt> or <tt>private_key_jwt</tt> token endpoint authentication methods). Deployments that authenticate clients only via <tt>client_secret_basic</tt> or <tt>client_secret_post</tt> are not exposed.</p>"}], "value": "The attack requires that the Boruta deployment has provisioned at least one OAuth client configured to authenticate via JWT client assertions (client_secret_jwt or private_key_jwt token endpoint authentication methods). Deployments that authenticate clients only via client_secret_basic or client_secret_post are not exposed."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:malach-it:boruta_auth:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.3.7", "versionStartIncluding": "2.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Pascal Knoth"}, {"lang": "en", "type": "remediation developer", "value": "Pascal Knoth"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen / EEF"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion to authenticate as the issuing OAuth client after the assertion has expired.</p><p>Boruta accepts JWT-based client authentication (<tt>client_secret_jwt</tt> and <tt>private_key_jwt</tt> token endpoint authentication methods) but never enforces that the assertion's <tt>exp</tt> claim is in the future. The pre-check helper <tt>'Elixir.Boruta.Oauth.Request.Base':check_expiration/1</tt> in <tt>lib/boruta/oauth/request/base.ex</tt> only verifies that an <tt>exp</tt> claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, <tt>'Elixir.Boruta.Oauth.Authorization.Client.Token':token_config/0</tt> in <tt>lib/boruta/oauth/authorization/client.ex</tt>, returns an empty map, so Joken's default <tt>exp</tt> claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges.</p><p>This issue affects boruta: from 2.3.0 before 2.3.7.</p>"}], "value": "Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion to authenticate as the issuing OAuth client after the assertion has expired.\n\nBoruta accepts JWT-based client authentication (client_secret_jwt and private_key_jwt token endpoint authentication methods) but never enforces that the assertion's exp claim is in the future. The pre-check helper Boruta.Oauth.Request.Base.check_expiration/1 in lib/boruta/oauth/request/base.ex only verifies that an exp claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, Boruta.Oauth.Authorization.Client.Token.token_config/0 in lib/boruta/oauth/authorization/client.ex, returns an empty map, so Joken's default exp claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges.\n\nThis issue affects boruta: from 2.3.0 before 2.3.7."}], "impacts": [{"capecId": "CAPEC-60", "descriptions": [{"lang": "en", "value": "CAPEC-60 Reusing Session IDs (aka Session Replay)"}]}], "metrics": [{"cvssV4_0": {"attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 9.1, "baseSeverity": "CRITICAL", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-294", "description": "CWE-294 Authentication Bypass by Capture-replay", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-31T04:20:43.209Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/malach-it/boruta_auth/security/advisories/GHSA-xjv8-vmh5-xhf6"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-53431.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-53431"}, {"tags": ["patch"], "url": "https://github.com/malach-it/boruta_auth/commit/5204f88f9b2cdd9637a755337ed5f99185be5474"}, {"tags": ["patch"], "url": "https://github.com/malach-it/boruta_auth/commit/69363432aa36760fc5438e4e17115d0f7c1b925a"}], "source": {"discovery": "INTERNAL"}, "title": "Boruta accepts expired JWT client assertions due to missing exp claim validation", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Restrict the use of JWT-based client authentication (<tt>client_secret_jwt</tt> and <tt>private_key_jwt</tt>) to highly trusted clients, and prefer non-JWT client authentication methods (<tt>client_secret_basic</tt> or <tt>client_secret_post</tt>) where possible. Where JWT client authentication must remain enabled, issue short-lived client assertions and protect them from exposure in application logs, fronting proxies, browser tooling, and observability systems to reduce the window for replay.</p>"}], "value": "Restrict the use of JWT-based client authentication (client_secret_jwt and private_key_jwt) to highly trusted clients, and prefer non-JWT client authentication methods (client_secret_basic or client_secret_post) where possible. 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Where JWT client authentication must remain enabled, issue short-lived client assertions and protect them from exposure in application logs, fronting proxies, browser tooling, and observability systems to reduce the window for replay.</p>", "base64": false}]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion to authenticate as the issuing OAuth client after the assertion has expired.\n\nBoruta accepts JWT-based client authentication (client_secret_jwt and private_key_jwt token endpoint authentication methods) but never enforces that the assertion's exp claim is in the future. The pre-check helper Boruta.Oauth.Request.Base.check_expiration/1 in lib/boruta/oauth/request/base.ex only verifies that an exp claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, Boruta.Oauth.Authorization.Client.Token.token_config/0 in lib/boruta/oauth/authorization/client.ex, returns an empty map, so Joken's default exp claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges.\n\nThis issue affects boruta: from 2.3.0 before 2.3.7.", "supportingMedia": [{"type": "text/html", "value": "<p>Authentication Bypass by Capture-replay vulnerability in malach-it Boruta allows an attacker who has obtained a previously valid JWT client assertion to authenticate as the issuing OAuth client after the assertion has expired.</p><p>Boruta accepts JWT-based client authentication (<tt>client_secret_jwt</tt> and <tt>private_key_jwt</tt> token endpoint authentication methods) but never enforces that the assertion's <tt>exp</tt> claim is in the future. The pre-check helper <tt>'Elixir.Boruta.Oauth.Request.Base':check_expiration/1</tt> in <tt>lib/boruta/oauth/request/base.ex</tt> only verifies that an <tt>exp</tt> claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, <tt>'Elixir.Boruta.Oauth.Authorization.Client.Token':token_config/0</tt> in <tt>lib/boruta/oauth/authorization/client.ex</tt>, returns an empty map, so Joken's default <tt>exp</tt> claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges.</p><p>This issue affects boruta: from 2.3.0 before 2.3.7.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-294", "description": "CWE-294 Authentication Bypass by Capture-replay"}]}], "configurations": [{"lang": "en", "value": "The attack requires that the Boruta deployment has provisioned at least one OAuth client configured to authenticate via JWT client assertions (client_secret_jwt or private_key_jwt token endpoint authentication methods). Deployments that authenticate clients only via client_secret_basic or client_secret_post are not exposed.", "supportingMedia": [{"type": "text/html", "value": "<p>The attack requires that the Boruta deployment has provisioned at least one OAuth client configured to authenticate via JWT client assertions (<tt>client_secret_jwt</tt> or <tt>private_key_jwt</tt> token endpoint authentication methods). Deployments that authenticate clients only via <tt>client_secret_basic</tt> or <tt>client_secret_post</tt> are not exposed.</p>", "base64": false}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:malach-it:boruta_auth:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.3.7", "versionStartIncluding": "2.3.0"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-31T04:20:43.209Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53431", "state": "PUBLISHED", "dateUpdated": "2026-07-31T04:20:43.209Z", "dateReserved": "2026-06-09T11:01:47.529Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-07-30T14:17:27.909Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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The pre-check helper Boruta.Oauth.Request.Base.check_expiration/1 in lib/boruta/oauth/request/base.ex only verifies that an exp claim is present (it pattern-matches on the existence of the key and returns success), and the Joken token configuration used for signature verification, Boruta.Oauth.Authorization.Client.Token.token_config/0 in lib/boruta/oauth/authorization/client.ex, returns an empty map, so Joken's default exp claim validator is not engaged either. Any attacker who obtains a validly-signed client assertion (for example through logs, reverse proxies, browser tooling, or other observability surfaces) can replay it indefinitely to authenticate as the client and obtain access tokens with that client's privileges.\n\nThis issue affects boruta: from 2.3.0 before 2.3.7."}, {"lang": "es", "value": "Una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n por captura-repetici\u00f3n en malach-it Boruta permite a un atacante que ha obtenido una aserci\u00f3n de cliente JWT previamente v\u00e1lida autenticarse como el cliente OAuth emisor despu\u00e9s de que la aserci\u00f3n haya expirado.\n\nBoruta acepta la autenticaci\u00f3n de cliente basada en JWT (m\u00e9todos de autenticaci\u00f3n de punto final de token client_secret_jwt y private_key_jwt) pero nunca impone que la declaraci\u00f3n \u2019exp\u2019 de la aserci\u00f3n est\u00e9 en el futuro. La funci\u00f3n auxiliar de pre-verificaci\u00f3n Boruta.Oauth.Request.Base.check_expiration/1 en lib/boruta/oauth/request/base.ex solo verifica que una declaraci\u00f3n \u2019exp\u2019 est\u00e9 presente (hace coincidir patrones con la existencia de la clave y devuelve \u00e9xito), y la configuraci\u00f3n de token de Joken utilizada para la verificaci\u00f3n de firma, Boruta.Oauth.Authorization.Client.Token.token_config/0 en lib/boruta/oauth/authorization/client.ex, devuelve un mapa vac\u00edo, por lo que el validador de declaraci\u00f3n \u2019exp\u2019 predeterminado de Joken tampoco se activa. Cualquier atacante que obtenga una aserci\u00f3n de cliente v\u00e1lidamente firmada (por ejemplo, a trav\u00e9s de registros, proxies inversos, herramientas de navegador u otras superficies de observabilidad) puede reproducirla indefinidamente para autenticarse como el cliente y obtener tokens de acceso con los privilegios de ese cliente.\n\nEste problema afecta a boruta: desde 2.3.0 antes de 2.3.7."}], "id": "CVE-2026-53431", "lastModified": "2026-10-23T22:10:00.160", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.1, "baseSeverity": "CRITICAL", "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:P/PR:N/UI:N/VC:H/VI:H/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": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53431", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-30T16:12:55.290055Z", "version": "2.0.3"}}]}, "published": "2026-07-30T15:16:33.567", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-53431.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/malach-it/boruta_auth/commit/5204f88f9b2cdd9637a755337ed5f99185be5474"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/malach-it/boruta_auth/commit/69363432aa36760fc5438e4e17115d0f7c1b925a"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/malach-it/boruta_auth/security/advisories/GHSA-xjv8-vmh5-xhf6"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-53431"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/malach-it/boruta_auth/security/advisories/GHSA-xjv8-vmh5-xhf6"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-294"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.3.0,2.3.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "boruta", "source": "cna", "vendor": "malach-it"}, "product": "boruta", "vendor": "malach-it"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "5bfbe1c5443bffe71cf1bf954bbdff61327d9a83"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "5204f88f9b2cdd9637a755337ed5f99185be5474"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "code_commit", "value": "69363432aa36760fc5438e4e17115d0f7c1b925a"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "boruta", "source": "cna", "vendor": "malach-it"}, "product": "boruta", "vendor": "malach-it"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "boruta_auth", "vendor": "malach-it"}], "created": "2026-07-30T19:15:04.432435+00:00", "updated": "2026-08-03T11:00:03.626283+00:00", "vendors": ["malach-it", "malach-it$PRODUCT$boruta", "malach-it$PRODUCT$boruta_auth"]}