How severe is CVE-2026-34828?

CVE-2026-34828 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-34828 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34828?

CVE-2026-34828 affects Nadh Listmonk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34828?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34828 have an EU (EUVD) identifier?

Yes. CVE-2026-34828 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18476.

When was CVE-2026-34828 published?

CVE-2026-34828 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-34828

CVE-2026-34828 is a high-severity vulnerability in Nadh Listmonk with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-613.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18476
Weakness: CWE-613
Affected product: Nadh Listmonk
Published: 2026-04-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-34828?: 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.
How severe is CVE-2026-34828?: CVE-2026-34828 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-34828 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34828?: CVE-2026-34828 affects Nadh Listmonk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34828?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34828 have an EU (EUVD) identifier?: Yes. CVE-2026-34828 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18476.
When was CVE-2026-34828 published?: CVE-2026-34828 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nadh:listmonk:*:*:*:*:*:*:*:*

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