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AI / ML CVE-2026-27478

| EUVD-2026-11304 CRITICAL
Authentication Bypass by Spoofing (CWE-290)
2026-03-11 security-advisories@github.com GHSA-qqcj-rghw-829x
Authentication Bypass AI / ML
9.1
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:07 vuln.today
CVE Published
Mar 11, 2026 - 20:16 nvd
CRITICAL 9.1

DescriptionGitHub Advisory

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.

AnalysisAI

Auth bypass in Unity Catalog 0.4.0 and earlier.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft JWT with untrusted issuer claim
Delivery
Submit to token exchange endpoint
Exploit
Endpoint fetches attacker-controlled JWKS
Execution
Validate forged JWT signature
Impact
Bypass authentication and gain access
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Vulnerability AssessmentAI

Exploitation Unity Catalog versions 0.4.0 and earlier with token exchange endpoint (/api/1.0/unity-control/auth/tokens) enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.1. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Bypass auth to access data catalog.
Remediation Update. Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all systems running Unity Catalog 0.4.0 or earlier and isolate them from production networks if possible; enable enhanced logging on token exchange endpoints (/api/1.0/unity-control/auth/tokens). …

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CVE-2026-27478 vulnerability details – vuln.today
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