CVE-2026-128332
Deferred Deferred - Pending Action

2FA Bypass via TOTP Brute-Force in Listmonk

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
Listmonk 6.0.0 before 7.0.0-beta.2 contains a 2FA bypass vulnerability that allows attackers with a valid password to brute-force TOTP codes because the attempt counter resets on every new password login. Attackers can repeatedly submit credentials to POST /admin/login to obtain fresh tokens, each allowing 15 more guesses, gaining sessions for 2FA-protected accounts including Super Admin.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-128332
EUVD
EUVD-2026-125045

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
listmonk listmonk to 7.0.0-beta.2 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-307 The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is a 2FA bypass in Listmonk versions 6.0.0 to 7.0.0-beta.1. Attackers with a valid password can brute-force TOTP codes because the attempt counter resets on every new password login. Each login generates fresh tokens allowing 15 guesses, enabling session hijacking for 2FA-protected accounts including Super Admin.

Detection Guidance

Monitor login attempts to POST /admin/login for repeated submissions with valid passwords but failed 2FA. Check for multiple token generations per session, especially targeting Super Admin accounts. Review logs for 15+ TOTP attempts per session.

Impact Analysis

Attackers could gain unauthorized access to accounts with 2FA enabled, including high-privilege Super Admin accounts. This could lead to data breaches, privilege escalation, or complete system compromise if sensitive data is exposed or manipulated.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR's data protection principles and HIPAA's security requirements. Organizations may face fines, legal penalties, and reputational damage for non-compliance.

Mitigation Strategies

Upgrade to listmonk version 7.0.0-beta.2 or later to apply the security patch. Implement strict rate limiting on /admin/login and /admin/login/twofa endpoints. Disable Super Admin 2FA temporarily if urgent access is required.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-128332. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart

Security Radar

News mentioning this vulnerability
Loading related security news...