Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88
- https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88
FAQ
What is CVE-2026-40873?
CVE-2026-40873 is a documented vulnerability. 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, allowi...
How severe is CVE-2026-40873?
CVSS scoring is not yet available for CVE-2026-40873. Check NVD for updates.
Is there a patch for CVE-2026-40873?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.