Unity Catalog has a JWT Issuer Validation Bypass tht Allows Complete User Impersonation
Context: 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. Way to exploit: An attacker can exploit this by: Hosting their own OIDC-compliant server with a valid JWKS endpoint Signing a JWT with …