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CVE-2026-54030

9.3 critical SSVC exploitation: poc Analyzed
NVD · CVE.org

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to steal access tokens intended for a legitimate server. This vulnerability is fixed in 0.8.5.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.3 · librechatNVD modified 2026-10-25 22:10

Affected (CPE criteria) 2

  • cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.5:rc1:*:*:*:*:*:*

References 2