CVE-2026-54040

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 5.9
EPSS 0.0018
EPSS Percentile 7.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-306
Status published
Products (2)
danny-avila/LibreChat < 0.8.4-rc1
librechat/librechat < 0.8.3
Published Jun 25, 2026
Tracked Since Jun 25, 2026