LibreChat is a ChatGPT clone with additional features. - ATR-2026-00566 (63347a6b-74c3-5bc2-a884-e8f44ead8007)
NVD-tracked CVE CVE-2026-31951 (CVSS v3 6.8 (MEDIUM)). 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.