CVE-2026-27478

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

Published 11 Mar 2026Modified 17 Jun 2026CWE 290, 346, 1390

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

GHSA9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by GHSA.

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 packages and fixed versions

Source	Package	Fixed in
maven::GitHub Security Advisory Maven	io.unitycatalog:unitycatalog-server	0.4.1

References

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