CVE-2026-54040

HighCVSS 7.1/10Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Weakness enumeration

CWE-306

Affected software

Vendor	Product	Versions
danny-avila	LibreChat	< 0.8.4-rc1

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-h59w-x9h4-m6gvExploit, Vendor Advisory
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-h59w-x9h4-m6gvExploit, Vendor Advisory

Timeline

Published: Jun 25, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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