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CVE-2026-54036: LibreChat: 2FA Re-enrollment Allows Full Account 2FA Takeover Without OTP Verification

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-25 · updated 2026-10-25
• Weakness: CWE-306

Description

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the GET /api/auth/2fa/enable endpoint can be called by an authenticated user (or attacker with a stolen session) even when 2FA is already fully enabled on the account. This endpoint overwrites the existing TOTP secret, generates new backup codes, and sets twoFactorEnabled to false — all without requiring any TOTP or backup code verification. An attacker with a valid session token can completely take over a victim's 2FA, locking the legitimate user out of their own two-factor authentication. This vulnerability is fixed in 0.8.4-rc1.

Affected products

• danny-avila LibreChat: through 0.8.3

References

• https://github.com/danny-avila/LibreChat/security/advisories/GHSA-45fp-6q26-wfgq
• https://github.com/danny-avila/LibreChat/security/advisories/GHSA-45fp-6q26-wfgq

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