CVE-2021-39201: Debian Linux

Medium severity, CVSS 5.4. EPSS: 1.5% chance of exploitation in the next 30 days.

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. ### Impact The issue allows an authenticated but low-privileged user (like contributor/author) to execute XSS in the editor. This bypasses the restrictions imposed on users who do not have the permission to post `unfiltered_html`. ### Patches This has been patched in WordPress 5.8, and will be pushed to older versions via minor releases (automatic updates). It's strongly recommended that you keep auto-updates enabled to receive the fix. ### References https://wordpress.org/news/category/releases/ https://hackerone.com/reports/1142140 ### For more information If you have any questions or comments about this advisory: * Open an issue in [HackerOne](https://hackerone.com/wordpress)

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• WordPress WordPress: from 5.0, before 5.8 (fixed in 5.8)

Published 2021-09-09. Last modified 2026-06-17.