CVE-2026-54040CWE-306

LibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass

Medium · published June 25, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
16.5
In the wild
Unconfirmed
What it is

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/auth/2fa/backup/regenerate endpoint regenerates all 2FA backup codes without requiring any TOTP token or existing backup code verification. An attacker with a stolen session token can silently replace a victim's backup codes and use them to bypass 2FA login or disable 2FA entirely. This vulnerability is fixed in 0.8.4-rc1.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00258 · 16.5th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-06-25T15:45Z
EPSS history
Timeline
  • 25 JUN 15:45Z
    LibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass
    cvelistv5