Medium 4.8Published Jan 21, 2026

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

Updated under an hour ago (Oct 27, 2026, 6:40 AM ET)

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It affects GetSimple CMS My SMTP Contact Plugin and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for GetSimple CMS My SMTP Contact Plugin

Exploited in the last 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.

CVSS: 4.8 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Modified
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

GetSimple CMS My SMTP Contact Plugin getsimple_cms:my_smtp_contact_plugin (from the name)	1.1.2	CNA record
get-simple getsimplecms get-simple:getsimplecms	1.1.2	NVD

References

References

https://github.com/boku7/gsSMTP-Csrf2Xss2RCE/	technical-description, exploit, third-party-advisory
http://get-simple.info	product
https://github.com/GetSimpleCMS/GetSimpleCMS	product
https://www.exploit-db.com/exploits/49798	exploit, third-party-advisory, vdb-entry
https://www.vulncheck.com/advisories/getsimple-cms-my-smtp-contact-plugin-stored-xss	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.