CVE-2020-21353: Get-Simple Getsimplecms

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

A stored cross site scripting (XSS) vulnerability in /admin/snippets.php of GetSimple CMS 3.4.0a allows attackers to execute arbitrary web scripts or HTML via crafted payload in the Edit Snippets module.

Affected products

• Get-Simple Getsimplecms: version 3.4.0a only

Published 2021-08-06. Last modified 2026-06-17.