CVE-2026-27478 — Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation

CVE-2026-27478

Unity Catalog has a JWT Issuer Validation Bypass Allows Complete User Impersonation PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
unitycatalog / unitycatalog	affected <= 0.4.0

CWE

CWE-290, CWE-346, CWE-1390

References

https://github.com/unitycatalog/unitycatalog/security/advisories/GHSA-qqcj-rghw-829x

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.