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CVE-2026-31951

5.7 medium SSVC exploitation: poc Analyzed
NVD · CVE.org

LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP (Model Context Protocol) servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containing `{{LIBRECHAT_OPENID_ACCESS_TOKEN}}` (and others), causing victims who call tools on that server to have their OAuth tokens exfiltrated. Version 0.8.3-rc2 fixes the issue.

Fix

Patch, vendor advisory and mitigation references on NVD 1

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 5.7 · librechatNVD modified 2026-10-26 21:10

Affected (CPE criteria) 2

  • cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.3:rc1:*:*:*:*:*:*

References 1