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Vulnerability record · CVE-2026-34584 · published 2 April 2026

CVE-2026-34584: Nadh listmonk insecure direct object reference vulnerability

NNadh · Listmonk

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.

5.4 CVSS 3.1 Medium EPSS 0.29% · top 80.2% CWE-639 · Insecure direct object reference
5.4CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
24 Jul 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/knadh/listmonk/commit/347f5976759232c36e571cf58b4bfe33c2794f35 Patch
https://github.com/knadh/listmonk/releases/tag/v6.1.0 ProductRelease Notes
https://github.com/knadh/listmonk/security/advisories/GHSA-85j8-5c6w-gcpv PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-34584), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.