What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-639

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.

Affected products

• knadh listmonk: from 4.1.0 before 6.1.0 — fixed in 6.1.0

How to fix

Upgrade to a fixed version: knadh listmonk 6.1.0. Check the vendor advisory for mitigations.

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

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