CVE-2026-27478
Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-290 CWE-346 CWE-1390 |
| Vendor | unitycatalog |
| Product | unitycatalog |
| Published | Mar 11, 2026 |
| Last Updated | Mar 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
unitycatalog / unitycatalog
<= 0.4.0