Skip to content
OpenAdvisories
Medium · 5.4 CVE-2026-34584 EUVD-2026-18450

listmonk: Broken Access Control in CSV Import (Unauthorized List Assignment)

Published Apr 2, 2026 · Updated Apr 2, 2026 · Assigned by GitHub_M

Description

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

VendorProductAffectedFixed
knadh listmonk >= 4.1.0, < 6.1.0 —

References