CVE-2026-34584

listmonk: Broken Access Control in CSV Import (Unauthorized List Assignment)

MEDIUM
5.4
CVSS Score
Published: April 2, 2026 at 05:31 PM UTC
Updated: July 24, 2026 at 09:20 PM UTC
2 products affected across 2 vendorsListmonkListmonk

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

4.1.0 ≤ v < 6.1.0
Affected range stops below 6.1.0, so it looks safe — our inference, not a vendor statement
v < 6.1.0
Affected range stops below 6.1.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (3)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/knadh/listmonk/security/advisories/GHSA-85j8-5c6w-gcpv
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/knadh/listmonk/releases/tag/v6.1.0

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-639

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