listmonk is a standalone, self-hosted, newsletter and mailing list manager. Prior to version 6.0.0, lower-privileged user with campaign management permissions can inject malicious JavaScript into campaigns or templates. When a higher-privileged user (Super Admin) views or previews this content, the XSS executes in their browser context, allowing the attacker to perform privileged actions such as creating backdoor admin accounts. The attack can be weaponized via the public archive feature, where victims simply need to visit a link - no preview click required. Version 6.0.0 fixes the issue.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-jmr4-p576-v565 listmonk Vulnerable to Stored XSS Leading to Admin Account Takeover
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 02 Jan 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 02 Jan 2026 21:15:00 +0000

Type Values Removed Values Added
Description listmonk is a standalone, self-hosted, newsletter and mailing list manager. Prior to version 6.0.0, lower-privileged user with campaign management permissions can inject malicious JavaScript into campaigns or templates. When a higher-privileged user (Super Admin) views or previews this content, the XSS executes in their browser context, allowing the attacker to perform privileged actions such as creating backdoor admin accounts. The attack can be weaponized via the public archive feature, where victims simply need to visit a link - no preview click required. Version 6.0.0 fixes the issue.
Title listmonk Vulnerable to Stored XSS Leading to Admin Account Takeover
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 5.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:P'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-02T21:18:57.834Z

Reserved: 2025-12-29T14:34:16.005Z

Link: CVE-2026-21483

cve-icon Vulnrichment

Updated: 2026-01-02T21:18:46.885Z

cve-icon NVD

Status : Received

Published: 2026-01-02T21:16:03.217

Modified: 2026-01-02T21:16:03.217

Link: CVE-2026-21483

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses