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.

INFO

Published Date :

2026-04-21T19:15:39.046Z

Last Modified :

2026-04-21T19:39:19.981Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-40873 vulnerability.

Vendors Products
Mailcow
  • Mailcow Dockerized
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-40873.

URL Resource
https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88-jvpp cve-icon cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability