High severityNVD Advisory· Published Apr 21, 2026· Updated Apr 22, 2026

CVE-2026-40873

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.

Affected products

Mailcow/Mailcow Dockerizedinferred
Range: <2026-03b

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88-jvppnvd

News mentions

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