Vulnerability Details CVE-2026-21483
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.5%
CVSS Severity
CVSS v3 Score 5.4
Products affected by CVE-2026-21483
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cpe:2.3:a:nadh:listmonk:0.1.0
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cpe:2.3:a:nadh:listmonk:0.1.1
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cpe:2.3:a:nadh:listmonk:0.1.2
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cpe:2.3:a:nadh:listmonk:0.2.0
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cpe:2.3:a:nadh:listmonk:0.2.1
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cpe:2.3:a:nadh:listmonk:0.2.2
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cpe:2.3:a:nadh:listmonk:0.3.0
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cpe:2.3:a:nadh:listmonk:0.3.1
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cpe:2.3:a:nadh:listmonk:0.3.2
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cpe:2.3:a:nadh:listmonk:0.3.3
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cpe:2.3:a:nadh:listmonk:0.4.0
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cpe:2.3:a:nadh:listmonk:0.5.0
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cpe:2.3:a:nadh:listmonk:0.5.1
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cpe:2.3:a:nadh:listmonk:0.5.2
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cpe:2.3:a:nadh:listmonk:0.6.0
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cpe:2.3:a:nadh:listmonk:0.6.1
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cpe:2.3:a:nadh:listmonk:0.6.2
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cpe:2.3:a:nadh:listmonk:0.7.0
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cpe:2.3:a:nadh:listmonk:0.8.0
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cpe:2.3:a:nadh:listmonk:0.9.0
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cpe:2.3:a:nadh:listmonk:1.0.0
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cpe:2.3:a:nadh:listmonk:1.1.0
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cpe:2.3:a:nadh:listmonk:2.0.0
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cpe:2.3:a:nadh:listmonk:2.1.0
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cpe:2.3:a:nadh:listmonk:2.2.0
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cpe:2.3:a:nadh:listmonk:2.3.0
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cpe:2.3:a:nadh:listmonk:2.4.0
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cpe:2.3:a:nadh:listmonk:2.5.0
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cpe:2.3:a:nadh:listmonk:2.5.1
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cpe:2.3:a:nadh:listmonk:3.0.0
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cpe:2.3:a:nadh:listmonk:4.0.0
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cpe:2.3:a:nadh:listmonk:4.0.1
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cpe:2.3:a:nadh:listmonk:4.1.0
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cpe:2.3:a:nadh:listmonk:5.0.0
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cpe:2.3:a:nadh:listmonk:5.0.1
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cpe:2.3:a:nadh:listmonk:5.0.2
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cpe:2.3:a:nadh:listmonk:5.0.3
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cpe:2.3:a:nadh:listmonk:5.1.0