Vulnerability in Mailcow Mailcow\
CVE-2025-53909
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 an…
EPSS: 0.005 (37.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Mailcow Mailcow\ — versions _dockerized
- Mailcow Mailcow-dockerized — versions < 2025-07
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-53909?
- CVE-2025-53909 is a critical-severity vulnerability in Mailcow Mailcow\, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 9.1/10. Published 2025-07-17.
- How severe is CVE-2025-53909?
- Critical severity. CVSS v3 base score is 9.1 out of 10.