VulnerabilityModified
CVE-2026-12773
A weakness has been identified in BerriAI litellm up to 1.59.8.
MEDIUM 5.5EPSS 1.02%
Does this matter?
Lower severity and a low EPSS score (1.02%). Track it; it rarely justifies an emergency change on its own.
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 4.0
- 5.5 MEDIUMCVSS: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/M
- EPSS
- 1.02% probability · 61th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-287, CWE-303
- Affected
- litellm/litellm
- Source
- cna@vuldb.com
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://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
- https://vuldb.com/submit/811282Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.