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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

LiteLLM MCP endpoint authentication bypass via forged Authorization header (CVE-2026-59822)

Prior to version 1.84.0, LiteLLM's MCP Streamable HTTP endpoint let an unauthenticated attacker send a fabricated Authorization header that triggered an OAuth2 passthrough fallback, substituting an empty UserAPIKeyAuth() object for failed key validation and granting access to MCP tooling without a valid LiteLLM key. The issue was fixed in release 1.84.0.

Disclosed 8 July 2026 · Record updated 13 September 2026

Impact

Unauthenticated requests could reach MCP tooling through the LiteLLM AI gateway without a valid API key.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-59822