CVE-2026-34584: Nadh Listmonk

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

listmonk is a standalone, self-hosted, newsletter and mailing list manager. From version 4.1.0 to before version 6.1.0, bugs in list permission checks allows users in a multi-user environment to access to lists (which they don't have access to) under different scenarios. This only affects multi-user environments with untrusted users. This issue has been patched in version 6.1.0.

Affected products

• Nadh Listmonk: from 4.1.0, before 6.1.0 (fixed in 6.1.0)

Published 2026-04-02. Last modified 2026-07-24.