CVE-2026-54040: 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…

PriorityP342high7.1CVSS 3.1

AVNACLPRLUINSUCLIHAN

EPSS

0.15%

4.6th percentile

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

2 ranges

Vendor	Product	Version range	Fixed in
danny-avila	librechat	< 0.8.4-rc1	0.8.4-rc1
librechat	librechat	<= 0.8.3	—

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