CVE-2026-40873
mailcow: dockerized vulnerable to stored XSS in Quarantine attachment filenames
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the Quarantine details modal injects attachment filenames into HTML without escaping, allowing arbitrary HTML/JS execution. An attacker can deliver an email with a crafted attachment name so that when an admin views the quarantine item, JavaScript executes in their browser, taking over their account. Version 2026-03b fixes the vulnerability.
| CWE | CWE-79 CWE-80 |
| Vendor | mailcow |
| Product | mailcow-dockerized |
| Published | Apr 21, 2026 |
| Last Updated | Apr 21, 2026 |
Stay Ahead of the Next One
Get instant alerts for mailcow mailcow-dockerized
Be the first to know when new unknown vulnerabilities affecting mailcow mailcow-dockerized are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
mailcow / mailcow-dockerized
< 2026-03b