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

Quick assessment

Affected
BerriAI litellm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LiteLLM是LiteLLM团队开源的一个应用程序。 LiteLLM存在授权问题漏洞，该漏洞源于MCP Proxy组件中文件litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py的函数UserAPIKeyAuth操作问题，可能导致身份验证不当。以下版本受到影响：1.59.0版本、1.59.1版本、1.59.2版本、1.59.3版本、1.59.4版本、1.59.5版本、1.59.6版本、1.59.7版本和1.59.8版本。

CVSS 7.3 · High EPSS 1.02% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 9

VendorProduct Version RangeStatus
BerriAI litellm 1.59.0 affected
1.59.1 affected
1.59.2 affected
1.59.3 affected
1.59.4 affected
1.59.5 affected
1.59.6 affected
1.59.7 affected
… +1 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
LiteLLM 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LiteLLM是LiteLLM团队开源的一个应用程序。 LiteLLM存在授权问题漏洞，该漏洞源于MCP Proxy组件中文件litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py的函数UserAPIKeyAuth操作问题，可能导致身份验证不当。以下版本受到影响：1.59.0版本、1.59.1版本、1.59.2版本、1.59.3版本、1.59.4版本、1.59.5版本、1.59.6版本、1.59.7版本和1.59.8版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
BerriAI litellm 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-2026-12795 7.3 HIGH BerriAI litellm SSO Debug Flow ui_sso.py json.dumps missing authentication
CVE-2026-12798 6.3 MEDIUM BerriAI litellm MCP OpenAPI Spec Loader openapi_to_mcp_generator.py load_openapi_spec_asyn
CVE-2026-12774 6.3 MEDIUM BerriAI litellm MCP Server Connection Testing rest_endpoints.py _execute_with_mcp_client s
CVE-2026-12796 6.3 MEDIUM BerriAI litellm SSO Authentication Flow ui_sso.py get_redirect_response_from_openid sessio
CVE-2026-12772 6.3 MEDIUM BerriAI litellm PROXY_ADMIN database API Key Generator login_utils.py authenticate_user se
CVE-2026-12797 6.3 MEDIUM BerriAI litellm Completions banned_keywords.py async_pre_call_hook authorization
CVE-2026-12770 5.4 MEDIUM BerriAI litellm Admin Key key_management_endpoints.py improper authorization
CVE-2026-12771 5.0 MEDIUM BerriAI litellm M2M JWT user_api_key_auth.py improper authorization
CVE-2026-12799 4.3 MEDIUM BerriAI 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

V. Comments for CVE-2026-12773

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