CVE-2026-31951

MEDIUM

6.8

Descripcion

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.

Detalles CVE

Puntuacion CVSS v3.16.8

SeveridadMEDIUM

Vector CVSSCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

Vector de ataqueNETWORK

ComplejidadLOW

Privilegios requeridosLOW

Interaccion usuarioREQUIRED

Publicado3/27/2026

Ultima modificacion3/30/2026

Fuentenvd

Avistamientos honeypot0

Productos afectados

librechat:librechat

Debilidades (CWE)

CWE-200

Referencias

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-pmw7-gqwj-f954(security-advisories@github.com)

Correlaciones IOC

Sin correlaciones registradas

This product uses data from the NVD API but is not endorsed or certified by the NVD.