CVE-2021-38339: Devondev Simple Matted Thumbnails

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

The Simple Matted Thumbnails WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to a reflected $_SERVER["PHP_SELF"] value in the ~/simple-matted-thumbnail.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.01.

Affected products

• Devondev Simple Matted Thumbnails: up to and including 1.01

Published 2021-09-10. Last modified 2026-06-17.