EUVD-2026-39454Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Network endpoint, low complexity, and a valid session (PR:L) with no interaction; no data disclosure (C:N) but 2FA secret overwrite and lockout give I:H and A:H.
Primary rating from Vendor (GitHub_M).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
7DescriptionNVD
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.
AnalysisAI
Two-factor authentication takeover in LibreChat before 0.8.4-rc1 lets any authenticated user — or an attacker wielding a stolen session token — call the GET /api/auth/2fa/enable endpoint to silently overwrite an account's existing TOTP secret, regenerate backup codes, and flip twoFactorEnabled to false, all without TOTP or backup-code verification. The flaw destroys the victim's working second factor and can lock the legitimate owner out of their own 2FA. …
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Recommended ActionAI
Within 24 hours: Inventory all LibreChat instances and identify versions running before 0.8.4-rc1. …
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Same technique Authentication Bypass
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External POC / Exploit Code
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