CVE-2026-34584: listmonk: Broken Access Control in CSV Import (Unauthorized List Assignment)
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
listmonkto a version that resolves this vulnerability.Fixed in 6.1.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34584?
CVE-2026-34584 has been classified as a high severity vulnerability due to broken access control affecting user permissions.
How do I fix CVE-2026-34584?
To fix CVE-2026-34584, upgrade listmonk to version 6.1.0 or later.
Who is affected by CVE-2026-34584?
CVE-2026-34584 affects users of listmonk versions 4.1.0 to before 6.1.0 in a multi-user environment.
What type of vulnerability is CVE-2026-34584?
CVE-2026-34584 is categorized as a broken access control vulnerability allowing unauthorized access to mailing lists.
What are the potential impacts of CVE-2026-34584?
The potential impacts of CVE-2026-34584 include unauthorized access to sensitive mailing lists and data exposure.