CVE-2021-47870: Get-Simple Getsimplecms

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

GetSimple CMS My SMTP Contact Plugin 1.1.2 suffers from a Stored Cross-Site Scripting (XSS) vulnerability. The plugin attempts to sanitize user input using htmlspecialchars(), but this can be bypassed by passing dangerous characters as escaped hex bytes. This allows attackers to inject arbitrary client-side code that executes in the administrator's browser when visiting a malicious page.

Affected products

• Get-Simple Getsimplecms: version 1.1.2 only

Published 2026-01-21. Last modified 2026-06-17.