Lukas-Reining

**Name of the Vulnerable Software and Affected Versions** Unity Catalog versions 0.4.0 and earlier **Description** Unity Catalog is an open, multi-modal Catalog for data and AI. A critical authentication bypass 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. This allows an attacker to forge any user identity by pointing validation to their own JWKS endpoint. **Recommendations** Versions prior to 0.4.0 should be used.