CVE-2026-34584

EUVD-2026-18450
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Affected Products (NVD)
VendorProductVersion
nadhlistmonk
4.1.0 ≤
𝑥
< 6.1.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/knadh/listmonk/commit/347f5976759232c36e571cf58b4bfe33c2794f35
https://github.com/knadh/listmonk/releases/tag/v6.1.0
https://github.com/knadh/listmonk/security/advisories/GHSA-85j8-5c6w-gcpv