CVE-2025-53909

critical · 9.1

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.

9.1

CVSS

0.5%

EPSS (exploit prob.)

39th

EPSS percentile

2025-07-17

Published

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-1336

Affected products

Vendor	Product	Affected versions
mailcow	mailcow:_dockerized	< 2025-07

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-53909