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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-27478

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

unitycatalog unitycatalog

  • <= 0.4.0affected

References