BerriAI LiteLLM Improper Authentication Vulnerability

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• NewsExploited · CISA KEVBerriAI · LiteLLM

  BerriAI LiteLLM Improper Authentication Vulnerability

  CVE-2026-59822

  BerriAI LiteLLM contains an improper authentication vulnerability in the MCP Streamable HTTP endpoint that could allow an unauthenticated attacker to establish an authenticated MCP session using an arbitrary Bearer token.

  CISA's required action · due 16 Sep 2026 for U.S. federal civilian agencies

  Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

  Cited by CISA: github.com · nvd.nist.gov

  Added to KEV 2 Sep 2026 · Source checked 4 Nov 2026, 16:25 UTC · CISA KEV entry

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