CVE-2026-27478
Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation
- State
- Published
- Severity
- 9.1 Critical
- Published
- Mar 11, 2026
- Updated
- Mar 12, 2026
- Reserved
- Feb 19, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
unitycatalogunitycatalog |
|
References
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