CVE-2026-12773

Affected software: litellm MCP Proxy (BerriAI) up to version 1.59.8. The vulnerability lies in UserAPIKeyAuth in litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py, where authentication can be bypassed if an invalid token triggers a swallowed 401/403 exception, allowing unauthen...