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CVE-2026-12773

BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication

Published: Jun 21, 2026Updated: Jun 22, 2026 Sources: CVE List NVDCWE-287
NVD MITRE
7.3CVSSHIGH
EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-287

Affected Products

litellmBerriAI
SaaS
AI / ML / llm-serving-inference
berriaicommercialAI / MLaka litellm, berriai/litellm

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://vuldb.com/vuln/372515
vuldb.com
https://vuldb.com/vuln/372515/cti
vuldb.com
https://vuldb.com/cve/CVE-2026-12773
vuldb.com
and 2 more references View all →

Timeline

Published
Jun 21, 2026
Last Updated
Jun 22, 2026

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