Vulnerability · Published Apr 2, 2026 · Assigned by GitHub_M
CVE-2026-34828listmonk: Active sessions remain valid after password reset and password change
High 7.1
In plain English
A high-severity security flaw in listmonk from knadh. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/knadh/listmonk | 1.1.1-0.20260329113754-1b5e8d38c778 | GHSA-h5j9-cvrw-v5qh |
| Go | github.com/knadh/listmonk | 1.1.1-0.20260329113754-1b5e8d38c778 | GO-2026-5414 |
Affected products (as reported)
Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
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