BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication_CVE-2026-12773

6.9 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Description

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.

Basic Information

ID CVE-2026-12773

Source VulDB

Published Jun 21, 2026 at 03:15

Affected Product

Vendor BerriAI

Product litellm

Version 1.59.0

Affected Versions BerriAI litellm 1.59.0
BerriAI litellm 1.59.1
BerriAI litellm 1.59.2
BerriAI litellm 1.59.3
BerriAI litellm 1.59.4
BerriAI litellm 1.59.5
BerriAI litellm 1.59.6
BerriAI litellm 1.59.7
BerriAI litellm 1.59.8

CWE Classification

CWE-287

References

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    "lastseen": "",
    "description": "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.",
    "published": "2026-06-21T03:15:08.647Z",
    "modified": "2026-06-21T03:15:08.647Z",
    "type": "cve",
    "title": "BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication",
    "source": "VulDB",
    "references": "https://vuldb.com/vuln/372515\nhttps://vuldb.com/vuln/372515/cti\nhttps://vuldb.com/cve/CVE-2026-12773\nhttps://vuldb.com/submit/811282\nhttps://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e",
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    "sourceHref": "",
    "cvss": {
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