CVE-2026-54040
LibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass
Description
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.
INFO
Published Date :
June 25, 2026, 3:45 p.m.
Last Modified :
June 25, 2026, 3:45 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-54040
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update LibreChat to version 0.8.4-rc1 or later.
- Regenerate backup codes after updating.
- Revoke old backup codes.
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CVE-2026-54040 vulnerability anywhere in the article.