Vulnerability in Knadh Listmonk
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 acco…
EPSS: 0.000 (2.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Knadh Listmonk — versions >= 4.1.0, < 6.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/knadh/listmonk/security/advisories/GHSA-h5j9-cvrw-v5qh (x_refsource_CONFIRM)
- https://github.com/knadh/listmonk/commit/db82035d619348949512dafdaf60c86037cafc9e (x_refsource_MISC)
- https://github.com/knadh/listmonk/releases/tag/v6.1.0 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-34828?
- CVE-2026-34828 is a high-severity vulnerability in Knadh Listmonk, classified under Insufficient Session Expiration. CVSS score: 7.1/10. Published 2026-04-02.
- How severe is CVE-2026-34828?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2026-34828 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.