CVE-2026-54036: Librechat

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the GET /api/auth/2fa/enable endpoint can be called by an authenticated user (or attacker with a stolen session) even when 2FA is already fully enabled on the account. This endpoint overwrites the existing TOTP secret, generates new backup codes, and sets twoFactorEnabled to false — all without requiring any TOTP or backup code verification. An attacker with a valid session token can completely take over a victim's 2FA, locking the legitimate user out of their own two-factor authentication. This vulnerability is fixed in 0.8.4-rc1.

Affected products

• Librechat Librechat: up to and including 0.8.3

Published 2026-06-25. Last modified 2026-06-26.