VulnerabilityAnalyzed

CVE-2026-34584

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.

MEDIUM 5.4EPSS 0.17%

Does this matter?

Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS: 0.17% probability · 7th percentile
CISA KEV: Not listed
Weakness: CWE-639
Affected: nadh/listmonk
Source: security-advisories@github.com

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.