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Medium severity5.9NVD Advisory· Published Jun 25, 2026· Updated Jun 29, 2026

CVE-2026-54040

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.

Affected products

2
  • Librechat/Librechat2 versions
    cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*range: <=0.8.3
    • (no CPE)range: <0.8.4-rc1

Patches

Vulnerability mechanics

References

1

News mentions

0

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