# CVE-2026-40873

> 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.

## Key facts

- **CVE ID:** CVE-2026-40873
- **Published:** 2026-04-21
- **CWE codes:** CWE-79, CWE-80

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40873

## Citation

> AI Analytics. CVE-2026-40873. Retrieved 2026-07-26 from https://api.ai-analytics.org/cve/CVE-2026-40873. Derived from NIST NVD. Licensed CC0.

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