Risk Letters

Exploited vulnerability

CVE-2026-59822

TLP:CLEAR

BerriAI LiteLLM Improper Authentication Vulnerability

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.

Facts

  • Vendor: BerriAI
  • Product: LiteLLM
  • CVSS: 8.8
  • EPSS (probability of exploitation within 30 days): 0.8 %
  • On CISA's Known Exploited Vulnerabilities list since: 2 September 2026
  • First known exploitation: 2 September 2026
  • CISA's deadline for US federal agencies: 16 September 2026
  • Weakness: CWE-287
  • First seen by Risk Letters: 2 September 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD