Stored Cross-Site Scripting Vulnerability in GetSimple CMS My SMTP Contact Plugin
CVE-2021-47870

5.4MEDIUM

Key Information:

Vendor: Getsimple Cms
Status: My Smtp Contact Plugin
Vendor: CVE Published:; 21 January 2026

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👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47870?

The My SMTP Contact Plugin version 1.1.2 of GetSimple CMS is susceptible to a Stored Cross-Site Scripting (XSS) vulnerability. The plugin attempts to sanitize user input using the htmlspecialchars() function; however, attackers can bypass this protection by submitting malicious characters in the form of escaped hex bytes. This flaw allows the execution of arbitrary client-side scripts in the administrator's browser upon visiting a compromised page, potentially leading to unauthorized actions or data exposure.

Affected Version(s)

My SMTP Contact Plugin 1.1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47870 - Proof of Concept