VULNERABILITY INTELLIGENCE

CVE-2025-53909

CVSS score9.1 CRITICAL
EPSS probability0.54%
CISA KEVNot currently listed
Published2025-07-17
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Description

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.

Weakness classification

  • CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

Primary references