VULNERABILITY INTELLIGENCE
CVE-2026-40873
EPSS probability0.42%
CISA KEVNot currently listed
Published2026-04-21
Last modified2026-10-26
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.
Weakness classification
- security-advisories@github.com: CWE-79