Medium 5.4Published Apr 2, 2026

CVE-2026-34584listmonk: Broken Access Control in CSV Import (Unauthorized List Assignment)

Updated under an hour ago (Oct 27, 2026, 11:20 AM ET)

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It affects knadh listmonk and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for knadh listmonk

Exploited in the last 30 days

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: 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-639
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

knadh listmonk knadh:listmonk (from the name)	from 4.1.0, < 6.1.0	CNA record
nadh listmonk nadh:listmonk	from 4.1.0 before 6.1.0	NVD

References

References

https://github.com/knadh/listmonk/security/advisories/GHSA-85j8-5c6w-gcpv	x-refsource-confirm, patch, vendor-advisory
https://github.com/knadh/listmonk/commit/347f5976759232c36e571cf58b4bfe33c2794f35	x-refsource-misc, patch
https://github.com/knadh/listmonk/releases/tag/v6.1.0	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.