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CVE-2026-34828

Nadh Listmonk vulnerability

7.1 HIGHPublic exploitEPSS 0.37%
  1. Published2 Apr 2026

Description

listmonk is a standalone, self-hosted, newsletter and mailing list manager. From version 4.1.0 to before version 6.1.0, a session management vulnerability allows previously issued authenticated sessions to remain valid after sensitive account security changes, specifically password reset and password change. As a result, an attacker who has already obtained a valid session cookie can retain access to the account even after the victim changes or resets their password. This weakens account recovery and session security guarantees. This issue has been patched in version 6.1.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected products

Nadh Listmonk≥ 4.1.0 < 6.1.0

Remediation

Fixed in
Nadh Listmonk≥ 6.1.0

References

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Frequently asked

Is CVE-2026-34828 being actively exploited?

CVE-2026-34828 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.37%.

How severe is CVE-2026-34828?

CVE-2026-34828 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.37% probability of exploitation.

Which products are affected by CVE-2026-34828?

Affected products include Nadh Listmonk.

How do I fix CVE-2026-34828?

Upgrade affected software to a fixed version, for example Nadh Listmonk 6.1.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34828 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.