CVE-2025-53909 — CRITICAL (9.1)

Q: How severe is CVE-2025-53909?

CVE-2025-53909 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2025-53909?

Check the references section above for vendor advisories and patch information. Affected products include: Mailcow Mailcow\.

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.

CVSS Score

9.1

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Mailcow	Mailcow\	< 2025-07, _dockerized

Related Weaknesses (CWE)

CWE-1336

References

FAQ

What is CVE-2025-53909?

CVE-2025-53909 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 syst...

How severe is CVE-2025-53909?

CVE-2025-53909 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2025-53909?

Check the references section above for vendor advisories and patch information. Affected products include: Mailcow Mailcow\.