Fiche vulnérabilité
CVE-2026-31951 : faille moyenne librechat librechat (CVSS 5.7)
Description
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.
En bref
- Sévérité
- Moyenne (CVSS 5.7)
- Vecteur CVSS
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
- Exploitation active
- Non signalée par la CISA
- Publication
- 27 mars 2026
- Dernière mise à jour
- 17 juin 2026
Produits concernés
- librechat librechat