{"id":"CVE-2026-114618","revision":"9639d6cfa53e4738b36ad63f235a43aa","records":[{"revision":"9639d6cfa53e4738b36ad63f235a43aa","observedAt":"2026-10-29T14:12:12.538+00:00","statement":{"source":"cve-program","id":"CVE-2026-114618","aliases":[],"title":"Authlib: Default JWT bearer grant accepts assertions for the wrong audience","description":"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.","state":0,"publishedAt":"2026-10-22T21:28:37.879+00:00","modifiedAt":"2026-10-29T12:29:17.976+00:00","affected":[{"ecosystem":"Vendor product","name":"authlib","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"authlib\",\n                    \"product\": \"authlib\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.9.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","score":6.8,"severity":"MEDIUM"}],"references":["https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc","https://github.com/authlib/authlib/pull/945","https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf","https://github.com/authlib/authlib/releases/tag/v1.9.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-114618","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-114618","identifiers":["CVE-2026-114618"]},"retained":false,"historicalAffected":[]}],"coverage":[]}