CVE-2021-28976: Get-Simple Getsimplecms

High severity, CVSS 7.2. EPSS: 7.5% chance of exploitation in the next 30 days.

Remote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.

Affected products

• Get-Simple Getsimplecms: before 3.3.15 (fixed in 3.3.15)

Published 2021-06-23. Last modified 2026-06-17.