PT-2026-51197 · Berriai · Litellm

Eric-C

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CVE-2026-12773

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Published

2026-06-21

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Updated

2026-06-25

CVSS v3.1

9.8

Critical

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions BerriAI litellm versions prior to 1.59.9
Description An improper authentication flaw exists in the MCP Proxy component. Specifically, the UserAPIKeyAuth() function within the file litellm/proxy/ experimental/mcp server/auth/user api key auth mcp.py allows remote unauthenticated attackers to bypass API key checks.
Recommendations Update to a version later than 1.59.8. As a temporary workaround, restrict access to the UserAPIKeyAuth() function in the MCP Proxy component to minimize the risk of exploitation.

Exploit

Fix

Improper Authentication

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Weakness Enumeration

CWE-287CWE-303

Related Identifiers

CVE-2026-12773
GHSA-4JCJ-7X88-M979

Affected Products

Litellm