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CVE-2026-12773

BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication

Published: Jun 21, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-287
7.3HIGH
NVD MITRE
EPSS Score
0.6%
Top 54.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not 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.

No summary for this CVE yet.

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-287CWE-303

Affected Products

litellm
oss-project
litellmMixed
AI / ML / llm-serving-inference
BerriAI
commercialaka berriai/litellm, litellm
litellmSaaS
AI / ML / llm-serving-inference

Exploitability

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

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e
gist.github.com
https://vuldb.com/cve/CVE-2026-12773
vuldb.com
https://vuldb.com/submit/811282
vuldb.com
and 5 more references View all →

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