CVE-2026-54040

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.

PUBLISHED Reserved 2026-06-11 | Published 2026-06-25 | Updated 2026-06-25 | Assigner GitHub_M

Problem types

CWE-306: Missing Authentication for Critical Function

Product status

References

github.com/...reChat/security/advisories/GHSA-h59w-x9h4-m6gv exploit

github.com/...reChat/security/advisories/GHSA-h59w-x9h4-m6gv

cve.org (CVE-2026-54040)

nvd.nist.gov (CVE-2026-54040)

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