CVE-2026-12773
6.9
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| BerriAI | litellm | 1.59.0 | affected |
| BerriAI | litellm | 1.59.1 | affected |
| BerriAI | litellm | 1.59.2 | affected |
| BerriAI | litellm | 1.59.3 | affected |
| BerriAI | litellm | 1.59.4 | affected |
| BerriAI | litellm | 1.59.5 | affected |
| BerriAI | litellm | 1.59.6 | affected |
| BerriAI | litellm | 1.59.7 | affected |
| BerriAI | litellm | 1.59.8 | affected |
Weaknesses
- CWE-287: Improper Authentication
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
Additional References
litellm: BerriAI litellm: Improper authentication in MCP Proxy via UserAPIKeyAuth function
Additional References
- https://access.redhat.com/security/cve/CVE-2026-12773
- https://bugzilla.redhat.com/show_bug.cgi?id=2491112
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json
References
- https://vuldb.com/vuln/372515
- https://vuldb.com/vuln/372515/cti
- https://vuldb.com/cve/CVE-2026-12773
- https://vuldb.com/submit/811282
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.