CVE-2021-47870 GetSimple CMS My SMTP Contact Plugin 1.1.2 - Stored XSS

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...