{"id":"CVE-2026-27478","aliases":["GHSA-qqcj-rghw-829x"],"url":"https://o3.security/vulnerability/CVE-2026-27478","summary":"Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation","details":"Unity Catalog is an open, multi-modal Catalog for data and AI. In 0.4.0 and earlier, a critical authentication bypass vulnerability exists in the Unity Catalog token exchange endpoint (/api/1.0/unity-control/auth/tokens). The endpoint extracts the issuer (iss) claim from incoming JWTs and uses it to dynamically fetch the JWKS endpoint for signature validation without validating that the issuer is a trusted identity provider.","published":"2026-03-11T19:36:03.271Z","modified":"2026-08-07T11:50:50.347162557Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.unitycatalog:unitycatalog-server","fixedVersion":"0.4.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27478.json"},{"type":"ADVISORY","url":"https://github.com/unitycatalog/unitycatalog/security/advisories/GHSA-qqcj-rghw-829x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27478"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:50.347162557Z"}}