{"id":"CVE-2026-55669","aliases":["GHSA-g5h5-m4hm-xjrr","GO-2026-5391"],"url":"https://o3.security/vulnerability/CVE-2026-55669","summary":"ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider","details":"ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's external JWT Identity Provider validates a token's signature and issuer (iss) but not the audience (aud) claim, allowing a validly signed token from a trusted issuer for another relying party to be accepted by ZITADEL. This issue is fixed in versions 3.4.12 and 4.15.2.","published":"2026-07-10T16:58:46.140Z","modified":"2026-08-12T03:51:15.128980505Z","cvss":{"score":4.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"},"epss":{"score":0.00155,"percentile":0.04956,"asOf":"2026-09-12"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","fixedVersion":"1.80.0-v2.20.0.20260615132747-d184e976fc79"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/zitadel/zitadel/releases/tag/v3.4.12"},{"type":"WEB","url":"https://github.com/zitadel/zitadel/releases/tag/v4.15.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55669.json"},{"type":"ADVISORY","url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-g5h5-m4hm-xjrr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55669"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:15.128980505Z"}}