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CVE-2026-128332: Listmonk Security Vulnerability

CVE-2026-128332 explained: critical Security Vulnerability in Listmonk. CVSS 9.1. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 13, 2026

CVSS
9.1 CRITICAL
EPSS
0.46%
CISA KEV
Not listed
CWE
CWE-307

Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS

CVE-2026-128332 Overview

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.

Critical Impact

Remote, unauthenticated attackers can exploit this Security Vulnerability in Listmonk. The CVSS base score is 9.1 (Critical).

Affected Products

  • Listmonk: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-13: CVE-2026-128332 published to the National Vulnerability Database by disclosure@vulncheck.com
  • 2026-11-13: last updated in the NVD database

Technical Details for CVE-2026-128332

Vulnerability Analysis

CVE-2026-128332 is a Security Vulnerability weakness (CWE-307) in Listmonk. Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction.

With a CVSS base score of 9.1 and an EPSS exploitation probability of 0.46 percent, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The vendor description states: 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.

Attack Vector

Based on the CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Attack complexity is high complexity.

No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Detection Methods for CVE-2026-128332

Detection Strategies

  • Inventory every instance of Listmonk and compare the running version with the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Run an authenticated vulnerability scan once your scanner ships a check for this CVE.

Monitoring Recommendations

  • Forward Listmonk application, access and audit logs to your SIEM for retrospective hunting.
  • Alert on new processes, configuration changes or outbound connections from the affected service.
  • Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.

How to Mitigate CVE-2026-128332

Immediate Actions Required

  • Apply the fixed version of Listmonk named in the vendor advisory.
  • Prioritize internet facing and business critical instances first.
  • Rescan after the change to confirm the exposure is closed.

Patch Information

Use the fixed version listed in the vendor advisory for Listmonk.

Workarounds

  • If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.

CWE References

Technical References

This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.

Frequently asked questions

CVE-2026-128332 is a critical severity Security Vulnerability in Listmonk with a CVSS score of 9.1. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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