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 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.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-h59w-x9h4-m6gv	Exploit Vendor Advisory
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-h59w-x9h4-m6gv	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*

History

29 Jun 2026, 16:00

Type	Values Removed	Values Added
First Time		Librechat librechat Librechat
CPE		cpe:2.3:a:librechat:librechat::::::::
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 - Exploit, Vendor Advisory

25 Jun 2026, 19:16

Type	Values Removed	Values Added
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 -

25 Jun 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-25 17:16

Updated : 2026-06-29 16:00

NVD link : CVE-2026-54040

Mitre link : CVE-2026-54040

CVE.ORG link : CVE-2026-54040

JSON object : View

Products Affected

librechat

librechat

CWE

CWE-306

Missing Authentication for Critical Function

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