CVE-2026-59822BerriAI LiteLLM Improper Authentication Vulnerability
- Product
- BerriAI LiteLLM
- Added to CISA KEV
- September 2, 2026
- Deadline for US federal agencies
- September 16, 2026
- Known ransomware use
- Not known
- EPSS, next 30 days
- 0.8%, higher than 57% of scored CVEs (Oct 25, 2026)
- Weakness
- CWE-287 Improper Authentication, CWE-306 Missing Authentication
What CISA says
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.
What CISA asks you to do
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.
Sources
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Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.