CVE-2026-12773

MEDIUM EPSS 44.2%
Published Jun 21, 20261w ago · Modified Jun 22, 20261w ago
5.5 CVSS 4.0
Medium
Find Similar
Published Jun 21, 2026 1w ago
Last Modified Jun 22, 2026 1w ago

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 Details

Base Score
5.5
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
44.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-287 Improper Authentication Authentication

References 5

  • gist.github.com https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e
  • vuldb.com https://vuldb.com/cve/CVE-2026-12773
  • vuldb.com https://vuldb.com/submit/811282
  • vuldb.com https://vuldb.com/vuln/372515
  • vuldb.com https://vuldb.com/vuln/372515/cti

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.