CVE-2021-47870

GetSimple CMS My SMTP Contact Plugin 1.1.2 - Stored XSS

CVSS 4.8 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.8EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

21 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

Affected products

GetSimple CMS · My SMTP Contact Plugin

References

http://get-simple.info https://github.com/boku7/gsSMTP-Csrf2Xss2RCE/https://github.com/GetSimpleCMS/GetSimpleCMS https://www.exploit-db.com/exploits/49798 https://www.vulncheck.com/advisories/getsimple-cms-my-smtp-contact-plugin-stored-xss