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Vulnerability record · CVE-2026-34828 · published 2 April 2026

CVE-2026-34828: Nadh listmonk insufficient session expiration vulnerability

NNadh · Listmonk

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.

7.1 CVSS 3.1 High EPSS 0.37% · top 71.9% CWE-613 · Insufficient session expiration
7.1CVSS 3.1 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
24 Jul 2026Last modified by NVD

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/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/knadh/listmonk/commit/db82035d619348949512dafdaf60c86037cafc9e Patch
https://github.com/knadh/listmonk/releases/tag/v6.1.0 ProductRelease Notes
https://github.com/knadh/listmonk/security/advisories/GHSA-h5j9-cvrw-v5qh ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-34828), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.