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Vulnerability record · CVE-2021-47870 · published 21 January 2026

CVE-2021-47870: Get-simple getsimplecms cross-site scripting vulnerability

Get Simple · Getsimplecms

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.

4.8 CVSS 4.0 Medium EPSS 0.27% · top 82.1% CWE-79 · Cross-site scripting
4.8CVSS 4.0 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://get-simple.info Product
https://github.com/GetSimpleCMS/GetSimpleCMS Product
https://github.com/boku7/gsSMTP-Csrf2Xss2RCE/ ExploitThird Party Advisory
https://www.exploit-db.com/exploits/49798 ExploitThird Party AdvisoryVDB Entry
https://www.vulncheck.com/advisories/getsimple-cms-my-smtp-contact-plugin-stored-xss Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-6188Get-simple getsimplecms code injection vulnerabilityA vulnerability was found in GetSimpleCMS 3.3.16/3.4.0a. It has been rated as critical. This issue affects some unknown processing of the file /admin…EPSS 0.97%9.8CVE-2023-46042Get-simple getsimplecms code injection vulnerabilityAn issue in GetSimpleCMS v.3.4.0a allows a remote attacker to execute arbitrary code via a crafted payload to the phpinfo().EPSS 23%9.1CVE-2020-18191Get-simple getsimplecms path traversal vulnerabilityGetSimpleCMS-3.3.15 is affected by directory traversal. Remote attackers are able to delete arbitrary files via /GetSimpleCMS-3.3.15/admin/log.phpEPSS 2.1%8.7CVE-2013-10032Get-simple getsimplecms missing authentication for critical function vulnerabilityAn authenticated remote code execution vulnerability exists in GetSimpleCMS version 3.2.1. The application’s upload.php endpoint allows authenticated…EPSS 3.7%8.6CVE-2021-47778Get-simple getsimplecms code injection vulnerabilityGetSimple CMS My SMTP Contact Plugin 1.1.2 contains a PHP code injection vulnerability. An authenticated administrator can inject arbitrary PHP code …EPSS 1.3%8.5CVE-2021-47860Get-simple getsimplecms cross-site request forgery vulnerabilityGetSimple CMS Custom JS 0.1 plugin contains a cross-site request forgery vulnerability that allows unauthenticated attackers to inject arbitrary clie…EPSS 0.27%7.2CVE-2021-28976Get-simple getsimplecms unrestricted file upload vulnerabilityRemote Code Execution vulnerability in GetSimpleCMS before 3.3.16 in admin/upload.php via phar filess.EPSS 7.5%6.9CVE-2024-11125Get-simple getsimplecms cross-site request forgery vulnerabilityA vulnerability was found in GetSimpleCMS 3.3.16 and classified as problematic. This issue affects some unknown processing of the file /admin/profile…EPSS 0.38%

Source: NIST National Vulnerability Database (record CVE-2021-47870), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.