CVE-2026-12773High· 7.3▾ TwilightLiteLLM: MCP Proxy Has Improper Authentication
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.2 · likelihood 0.2 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 10.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
1.0%
medium → high
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.
litellm < 1.84.0Upgrade to a patched release:
litellm 1.84.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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