CVE-2026-34584

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.

Score

CVSS 3.1 5.4 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-04-02

Last modified

2026-04-02

Weaknesses

CWE-639

Affected products

• Listmonk (Knadh)
• Listmonk (Nadh)

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