CVE-2026-54040: LibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-06-25 · updated 2026-10-25
Weakness: CWE-306

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.

Affected products

danny-avila LibreChat: through 0.8.3

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-h59w-x9h4-m6gv
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-h59w-x9h4-m6gv

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