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CVE-2025-53909

Mailcow Mailcow: Dockerized vulnerability

9.1 CRITICALEPSS 0.50%
  1. Published17 Jul 2025

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Mailcow Mailcow: Dockerized< 2025-07

Remediation

Fixed in
Mailcow Mailcow: Dockerized≥ 2025-07

References

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Frequently asked

Is CVE-2025-53909 being actively exploited?

CVE-2025-53909 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.50%.

How severe is CVE-2025-53909?

CVE-2025-53909 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2025-53909?

Affected products include Mailcow Mailcow: Dockerized.

How do I fix CVE-2025-53909?

Upgrade affected software to a fixed version, for example Mailcow Mailcow: Dockerized 2025-07 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-53909 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.