What is CVE-2026-27478?

CVE-2026-27478 is a critical-severity vulnerability in Unitycatalog, classified under Authentication Bypass by Spoofing. CVSS score: 9.1/10. Published 2026-03-11.

How severe is CVE-2026-27478?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Unitycatalog

CVE-2026-27478

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.

EPSS: 0.002 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Unitycatalog — versions <= 0.4.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-27478?: CVE-2026-27478 is a critical-severity vulnerability in Unitycatalog, classified under Authentication Bypass by Spoofing. CVSS score: 9.1/10. Published 2026-03-11.
How severe is CVE-2026-27478?: Critical severity. CVSS v3 base score is 9.1 out of 10.