CVE-2026-34584

Name: CVE-2026-34584
Creator: NVD / NIST
Published: 2026-04-02T18:16:30.51+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.17%

Last modified Jun 17, 2026

CVE-2026-34584 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

0.17%

6.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Nadh	Listmonk	>= 4.1.0, < 6.1.0

References

https://github.com/knadh/listmonk/commit/347f5976759232c36e571cf58b4bfe33c2794f35Patch
https://github.com/knadh/listmonk/releases/tag/v6.1.0Product, Release Notes
https://github.com/knadh/listmonk/security/advisories/GHSA-85j8-5c6w-gcpvPatch, Vendor Advisory

Timeline

Published: Apr 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34584?

How severe is CVE-2026-34584?

CVE-2026-34584 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34584?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34584?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST