CVE-2026-12773
Last modified
CVE-2026-12773 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.61% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Litellm | Litellm | < 1.59.9 |
References
- https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309eExploit, Third Party Advisory
- https://vuldb.com/cve/CVE-2026-12773Third Party Advisory, VDB Entry
- https://vuldb.com/submit/811282Exploit, Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/372515Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/372515/ctiPermissions Required, VDB Entry
- https://vuldb.com/submit/811282Exploit, Third Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-12773?
How severe is CVE-2026-12773?
How do I fix CVE-2026-12773?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-12761The miniOrange Social Login and Register (Discord, Google, T…9.8
- CVE-2026-12762IBM Cloud Pak For Business Automation 24.0.0, 24.0.1, 25.0.0…5.3
- CVE-2026-1277The URL Shortify plugin for WordPress is vulnerable to Open …4.7
- CVE-2026-12770A vulnerability was determined in BerriAI litellm up to 1.63…8.8
- CVE-2026-12771A vulnerability was identified in BerriAI litellm up to 1.82…7.5
- CVE-2026-12772A security flaw has been discovered in BerriAI litellm up to…6.3
- CVE-2026-12774A security vulnerability has been detected in BerriAI litell…6.3
- CVE-2026-12775A vulnerability was detected in Montodel House-Rental-Manage…7.3
- CVE-2026-12776A flaw has been found in Montodel House-Rental-Management up…6.3
- CVE-2026-12778A vulnerability has been found in AOMEI Partition Assistant …7.8
- CVE-2026-12779A vulnerability was found in AOMEI Dynamic Disk Manager up t…7.8
- CVE-2026-1278The Mandatory Field plugin for WordPress is vulnerable to St…4.4
Are you affected by CVE-2026-12773?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST