CVE-2026-12773

MEDIUM 6.9 PoC AVAILABLE

Published 2026-06-21 · Last modified 2026-06-30

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.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

0.6%chance of exploitation in 30 days · 45th percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

6.9CVSS 4.0 · MEDIUM

ConfidentialityLow
IntegrityLow
AvailabilityLow

What an attacker needs

✓Access: Reachable over the network — no local access needed
✓Privileges: No account or privileges required
✓User interaction: No user interaction needed
✓Complexity: No special conditions — reliably repeatable
✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

PoC https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e

Listed for defensive triage and patch prioritization.

Affected

Vendors Berriai Red Hat

Products Litellm Exploit Intelligence Red Hat Ansible Automation Platform 2 Red Hat Openshift Ai (Rhoai)

Weakness (CWE)

CWE-287: Improper authentication
CWE-303

CVSS vector

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

References

Sources: NVD · CVE.org · EPSS