CVE-2026-12773
HighCVSS 7.3Exploitation Probability (EPSS)
Elevated risk63th percentile - higher than 63% of all known CVEs
Summary
A weakness has been identified in BerriAI litellm up to version 1.59.8 in the UserAPIKeyAuth function of the MCP Proxy component. Manipulation of this function can lead to improper authentication, allowing remote attacks. An exploit has been publicly released and could be used in attacks.
Risk Assessment
The organization is at risk of unauthorized remote access to the system, potentially leading to data confidentiality and integrity breaches.
Recommendation
Immediately update BerriAI litellm to a version newer than 1.59.8 and apply available security patches. Additionally, consider monitoring authentication logs.
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Original NVD description (English source)
A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

