CVE-2021-47870

4.8 mediumEPSS 0.3%

Medium (4.8) in get-simple getsimplecms. EPSS 0.3% chance of exploitation in the next 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.

Severity

CVSS 4.0

4.8 medium

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

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-01-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

get-simple:getsimplecms

References

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

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