Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M

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

Medium 5.9

In plain English

A medium-severity missing authentication in LibreChat from danny-avila. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.3%top 82.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
danny-avila	LibreChat	< 0.8.4-rc1

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

References

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