CVE-2026-12773

HIGH

BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication

Title source: cna
STIX 2.1

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.

References (5)

Core 5
Core References
Vdb Entry, Technical Description vdb-entry technical-description
VDB-372515 | BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication
https://vuldb.com/vuln/372515
Signature, Permissions Required signature permissions-required
VDB-372515 | CTI Indicators (IOB, IOC, IOA)
https://vuldb.com/vuln/372515/cti
Third Party Advisory third-party-advisory
CVE-2026-12773 | CVE Analysis and Report
https://vuldb.com/cve/CVE-2026-12773
Third Party Advisory third-party-advisory
Submit #811282 | litellm <= 1.59.8 Improper Authentication (CWE-287)
https://vuldb.com/submit/811282

Scores

CVSS v3 7.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

Details

CWE
CWE-287
Status published
Products (9)
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
Published Jun 21, 2026
Tracked Since Jun 21, 2026