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CVE-2026-12773— BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication

CVSS 7.3 · High EPSS 0.60% · P44
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I. Basic Information for CVE-2026-12773

Vulnerability Information
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Vulnerability Title
BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
BerriAIlitellm 1.59.0 cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-12773

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III. Intelligence Information for CVE-2026-12773

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Proof of Concept for CVE-2026-12773 (1)

Same Patch Batch · BerriAI · 2026-06-21 · 10 CVEs total

CVE-2026-127957.3 HIGHBerriAI litellm SSO Debug Flow ui_sso.py json.dumps missing authentication
CVE-2026-127986.3 MEDIUMBerriAI litellm MCP OpenAPI Spec Loader openapi_to_mcp_generator.py load_openapi_spec_asyn
CVE-2026-127746.3 MEDIUMBerriAI litellm MCP Server Connection Testing rest_endpoints.py _execute_with_mcp_client s
CVE-2026-127966.3 MEDIUMBerriAI litellm SSO Authentication Flow ui_sso.py get_redirect_response_from_openid sessio
CVE-2026-127726.3 MEDIUMBerriAI litellm PROXY_ADMIN database API Key Generator login_utils.py authenticate_user se
CVE-2026-127976.3 MEDIUMBerriAI litellm Completions banned_keywords.py async_pre_call_hook authorization
CVE-2026-127705.4 MEDIUMBerriAI litellm Admin Key key_management_endpoints.py improper authorization
CVE-2026-127715.0 MEDIUMBerriAI litellm M2M JWT user_api_key_auth.py improper authorization
CVE-2026-127994.3 MEDIUMBerriAI litellm Incomplete Fix CVE-2025-0628 internal_user_endpoints.py ui_view_users impr

IV. Related Vulnerabilities

Same product: litellm
Same vendor: BerriAI
Same weakness: CWE-287

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