CVE-2020-18659: Get-Simple Getsimplecms

Medium severity, CVSS 6.1. EPSS: 1.3% chance of exploitation in the next 30 days.

Cross Site Scripting vulnerability in GetSimpleCMS <=3.3.15 via the (1) sitename, (2) username, and (3) email parameters to /admin/setup.php

Affected products

• Get-Simple Getsimplecms: up to and including 3.3.15

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