CVE-2026-31951 in danny-avila LibreChatinfo

Summary

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.

Responsible

GitHub_M

Reservation

03/10/2026

Disclosure

03/27/2026

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VulDB provides additional information and datapoints for this CVE:

ID	Vulnerability	CWE	Exp	Cou	CVE
354032	danny-avila LibreChat Model Context Protocol information disclosure	200	Not defined	Official fix	CVE-2026-31951

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