Paper/Archive/CVE-2025-53909

CVE-2025-53909

mailcow mailcow-dockerized — mailcow: dockerized vulnerable to SSTI in Quota and Quarantine Notification Template

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 45.3.453 × 209.1 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

mailcow: dockerized is an open source groupware/email suite based on docker. A Server-Side Template Injection (SSTI) vulnerability exists in versions prior to 2025-07 in the notification template system used by mailcow for sending quota and quarantine alerts. The template rendering engine allows template expressions that may be abused to execute code in certain contexts. The issue requires admin-level access to mailcow UI to configure templates, which are automatically rendered during normal system operation. Version 2025-07 contains a patch for the issue.

Affected

ProductAffectedFixed inSource

mailcow-dockerized< 2025-07–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/mailcow/mailcow-dockerized/security/advisories/GHSA-8p7g-6cjj-wr9m refgithub.com/mailcow/mailcow-dockerized/commit/8c5f6c03214a4b2bdbf3c78932f860eee949012b