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CVE-2025-53909— mailcow: dockerized vulnerable to SSTI in Quota and Quarantine Notification Template

Quick assessment

Affected
mailcow mailcow-dockerized
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mailcow: dockerized是mailcow开源的一个docker化的mailcow应用软件。 mailcow: dockerized 2025-07之前版本存在安全漏洞，该漏洞源于通知模板系统存在服务器端模板注入，可能导致代码执行。

CVSS 9.1 · Critical EPSS 0.50% · P41
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I. Basic Information for CVE-2025-53909

Vulnerability Information
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Vulnerability Title
mailcow: dockerized vulnerable to SSTI in Quota and Quarantine Notification Template
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
mailcow: dockerized 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mailcow: dockerized是mailcow开源的一个docker化的mailcow应用软件。 mailcow: dockerized 2025-07之前版本存在安全漏洞，该漏洞源于通知模板系统存在服务器端模板注入，可能导致代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
mailcow mailcow-dockerized < 2025-07 -

II. Public POCs for CVE-2025-53909

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III. Intelligence Information for CVE-2025-53909

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IV. Related Vulnerabilities

Same product: mailcow-dockerized
Same vendor: mailcow
Same weakness: CWE-1336

V. Comments for CVE-2025-53909

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