EUVD-2026-39454Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication required for critical functions
MITRE ATT&CK
1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv3 – Jun 26, 2026
Two-factor authentication takeover in LibreChat before 0.8.4-rc1 lets any authenticated user — or an attacker wielding a stolen session token — call the GET /api/auth/2fa/enable endpoint to silently overwrite an account's existing TOTP secret, regenerate backup codes, and flip twoFactorEnabled to false, all without TOTP or backup-code verification. The flaw destroys the victim's working second factor and can lock the legitimate owner out of their own 2FA. Publicly available exploit code exists (SSVC: PoC), but EPSS is low (0.18%, 8th percentile) and it is not listed in CISA KEV.
Earlier versions of this analysis (2)
Two-factor authentication takeover in LibreChat before 0.8.4-rc1 lets any authenticated user - or an attacker holding a stolen session token - call GET /api/auth/2fa/enable to silently overwrite a victim's existing TOTP secret, regenerate backup codes, and flip twoFactorEnabled to false, all without supplying any TOTP code or backup code. The flaw, an authentication bypass tied to a missing verification check on an already-2FA-enabled account, has a published vendor security advisory (GHSA-45fp-6q26-wfgq) but no public exploit identified at time of analysis and a low EPSS of 0.18%. CISA SSVC classifies exploitation as proof-of-concept stage with partial technical impact.
Two-factor authentication takeover in LibreChat prior to 0.8.4-rc1 allows an authenticated attacker holding a stolen session token to silently displace a victim's TOTP secret by calling GET /api/auth/2fa/enable - an endpoint that re-initializes 2FA enrollment without verifying the existing authenticator. The endpoint overwrites the TOTP secret, regenerates backup codes, and sets twoFactorEnabled to false, all in a single unauthenticated-to-2FA request, effectively locking the legitimate account owner out of their configured authenticator. No public exploit code or CISA KEV listing exists at time of analysis; the fix is confirmed in 0.8.4-rc1.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Network endpoint, low complexity, and a valid session (PR:L) with no interaction; no data disclosure (C:N) but 2FA secret overwrite and lockout give I:H and A:H.
Primary rating from Vendor (GitHub_M).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
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.
Executive ViewAI
LibreChat versions before 0.8.4-rc1 contain a critical two-factor authentication bypass that allows any authenticated user to silently disable another user's 2FA protection; publicly available exploit code exists. This vulnerability exposes organizations to account takeover and compliance risk by directly undermining multi-factor authentication controls. Immediate patching is essential to restore 2FA integrity across all user accounts.
Within 24 hours: Inventory all LibreChat instances and identify versions running before 0.8.4-rc1. Within 7 days: Test LibreChat 0.8.4-rc1 or later in staging environment and validate 2FA functionality remains intact after patch. Within 30 days: Deploy patched version to all production systems and confirm 2FA protection is restored for all user accounts.
Apply vendor patch.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
A vulnerability in danny-avila/librechat version git 81f2936 allows for path traversal due to improper sanitization of f
An arbitrary file deletion vulnerability exists in danny-avila/librechat version v0.7.5-rc2, specifically within the /ap
LibreChat before v0.8.2-rc2 allows any authenticated user to execute shell commands as root inside the container through
LibreChat 0.7.9 lets an authenticated user turn off two-factor authentication on their own account without supplying a v
Stored cross-site scripting and tracker injection in LibreChat 0.8.0 and earlier allow a user who can create a chat to c
LibreChat is a ChatGPT clone with additional features. Rated high severity (CVSS 8.6), this vulnerability is remotely ex
LibreChat 0.8.1-rc2 has SSRF in the Actions feature that allows authenticated users to make the server perform requests
In danny-avila/librechat version git 0c2a583, there is an improper input validation vulnerability. Rated high severity (
A mass assignment vulnerability exists in danny-avila/librechat, affecting all versions. Rated high severity (CVSS 7.5),
Unbounded `key` and `value` parameters on the LibreChat 0.7.9 memory API (`POST /api/memories` and `PATCH /api/memories/
An unhandled exception in the danny-avila/librechat repository, version git 600d217, can cause the server to crash, lead
An improper access control vulnerability (IDOR) exists in the delete attachments functionality of danny-avila/librechat
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