{"id":"CVE-2026-27478","state":"PUBLISHED","title":"Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation","description":"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.","publishedAt":"2026-03-11T19:36:03.271Z","updatedAt":"2026-03-12T19:57:39.336Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["unitycatalog unitycatalog"],"affected":[{"vendor":"unitycatalog","product":"unitycatalog","versions":[{"version":"<= 0.4.0","status":"affected"}]}],"references":["https://github.com/unitycatalog/unitycatalog/security/advisories/GHSA-qqcj-rghw-829x"],"weaknesses":["CWE-290","CWE-346","CWE-1390"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27478.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27478","state":"PUBLISHED","datePublished":"2026-03-11T19:36:03.271Z","dateUpdated":"2026-03-12T19:57:39.336Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-19T19:46:03.540Z"},"containers":{"cna":{"title":"Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"unitycatalog","product":"unitycatalog","versions":[{"version":"<= 0.4.0","status":"affected"}]}],"references":[{"url":"https://github.com/unitycatalog/unitycatalog/security/advisories/GHSA-qqcj-rghw-829x","name":"https://github.com/unitycatalog/unitycatalog/security/advisories/GHSA-qqcj-rghw-829x","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1390","lang":"en","description":"CWE-1390: Weak Authentication","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-11T19:36:03.271Z"},"source":{"advisory":"GHSA-qqcj-rghw-829x","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-12T19:57:32.423355Z","id":"CVE-2026-27478","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-12T19:57:39.336Z"}}]}}}