CVE-2020-4049: Debian Linux

Low severity, CVSS 2.4. EPSS: 2.5% chance of exploitation in the next 30 days.

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• WordPress WordPress: from 3.7, before 3.7.34 (fixed in 3.7.34); from 3.8, before 3.8.34 (fixed in 3.8.34); from 3.9, before 3.9.32 (fixed in 3.9.32); from 4.0, before 4.0.31 (fixed in 4.0.31); from 4.1, before 4.1.31 (fixed in 4.1.31); from 4.2, before 4.2.28 (fixed in 4.2.28); …

Published 2020-06-12. Last modified 2026-06-17.