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

Quick assessment

Affected
danny-avila LibreChat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

danny-avila LibreChat是danny-avila个人开发者的 Danny Avila LibreChat 0.8.4-rc1之前版本存在授权问题漏洞，该漏洞源于POST /api/auth/2fa/backup/regenerate端点无需TOTP令牌或现有备份代码验证即可重新生成所有双重验证备份代码，可能导致攻击者使用被盗会话令牌悄无声息地替换受害者备份代码并绕过双重验证登录或完全禁用双重验证。

CVSS 5.9 · Medium EPSS 0.26% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
danny-avila LibreChat < 0.8.4-rc1 affected
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I. Basic Information for CVE-2026-54040

Vulnerability Information
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Vulnerability Title
LibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Danny Avila LibreChat 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
danny-avila LibreChat是danny-avila个人开发者的 Danny Avila LibreChat 0.8.4-rc1之前版本存在授权问题漏洞，该漏洞源于POST /api/auth/2fa/backup/regenerate端点无需TOTP令牌或现有备份代码验证即可重新生成所有双重验证备份代码，可能导致攻击者使用被盗会话令牌悄无声息地替换受害者备份代码并绕过双重验证登录或完全禁用双重验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
danny-avila LibreChat < 0.8.4-rc1 -

II. Public POCs for CVE-2026-54040

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III. Intelligence Information for CVE-2026-54040

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Vendor Advisories for CVE-2026-54040 (1)

Same Patch Batch · danny-avila · 2026-06-25 · 9 CVEs total

CVE-2026-54030 8.0 HIGH LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
CVE-2026-54033 7.7 HIGH LibreChat: SSRF via User-Provided Custom Endpoint baseURL — no private IP validation on us
CVE-2026-54027 6.5 MEDIUM LibreChat: Image Upload Route Bypasses Agent Permission Check — Incomplete Fix for File Up
CVE-2026-54037 6.5 MEDIUM LibreChat: Incomplete Fix for CVE-2025-7105 — /api/convos/duplicate Lacks Rate Limiting Ap
CVE-2026-54024 6.5 MEDIUM LibreChat: Incomplete Fix for CVE-2024-11171 — Conversation Import Multer Instance Missing
CVE-2026-54025 5.4 MEDIUM LibreChat: Stored XSS via unescaped image alt text in markdown artifact preview
CVE-2026-54036 5.3 MEDIUM LibreChat: 2FA Re-enrollment Allows Full Account 2FA Takeover Without OTP Verification
CVE-2026-54029 5.3 MEDIUM LibreChat: IDOR in Message Deletion — Incomplete Fix for CVE-2024-41703 Leaves deleteMessa

IV. Related Vulnerabilities

Same product: LibreChat
Same vendor: danny-avila
Same weakness: CWE-306

V. Comments for CVE-2026-54040

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