{"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":"2026-10-29T12:29:17.976Z"},"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"}},"adp":[{"references":[{"url":"https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-29T12:28:44.727870Z","id":"CVE-2026-114618","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-29T12:29:17.976Z"}}]}}