{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-114618", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-21T20:34:25.600Z", "datePublished": "2026-10-22T21:28:37.879Z", "dateUpdated": "2026-10-22T21:28:37.879Z"}, "containers": {"cna": {"title": "Authlib: Default JWT bearer grant accepts assertions for the wrong audience", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1188", "lang": "en", "description": "CWE-1188: Insecure Default Initialization of Resource", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc"}, {"name": "https://github.com/authlib/authlib/pull/945", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/authlib/pull/945"}, {"name": "https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf"}, {"name": "https://github.com/authlib/authlib/releases/tag/v1.9.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/authlib/releases/tag/v1.9.0"}], "affected": [{"vendor": "authlib", "product": "authlib", "versions": [{"version": "< 1.9.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-22T21:28:37.879Z"}, "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 7523 JWTBearerGrant.get_audiences() returns an empty list, causing JWTBearerGrant.verify_claims() to require only that an aud claim exists without matching the current authorization server. An attacker holding a legitimate assertion for another service can present it to a server that shares the signing key and uses the default grant, obtaining an access token across a trust boundary. Implementations that override get_audiences() with the server's valid audience identifiers are not affected. This issue is fixed in version 1.9.0."}], "source": {"advisory": "GHSA-fch4-3c6x-j4gc", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "authlib", "vendor": "authlib", "versions": [{"status": "affected", "version": "< 1.9.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 7523 JWTBearerGrant.get_audiences() returns an empty list, causing JWTBearerGrant.verify_claims() to require only that an aud claim exists without matching the current authorization server. An attacker holding a legitimate assertion for another service can present it to a server that shares the signing key and uses the default grant, obtaining an access token across a trust boundary. Implementations that override get_audiences() with the server's valid audience identifiers are not affected. This issue is fixed in version 1.9.0."}], "id": "CVE-2026-114618", "lastModified": "2026-10-22T22:18:04.747", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-22T22:18:04.747", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf"}, {"source": "security-advisories@github.com", "url": "https://github.com/authlib/authlib/pull/945"}, {"source": "security-advisories@github.com", "url": "https://github.com/authlib/authlib/releases/tag/v1.9.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "CWE-1188"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.9.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "authlib", "source": "cna", "vendor": "authlib"}, "product": "authlib", "vendor": "authlib"}], "created": "2026-10-23T03:15:16.645811+00:00", "updated": "2026-10-23T06:00:12.267848+00:00", "vendors": ["authlib", "authlib$PRODUCT$authlib"]}