XSS in Get-simple Getsimplecms

CVE-2021-47870

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 esc…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (13.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-47870?
CVE-2021-47870 is a medium-severity vulnerability in Get-simple Getsimplecms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-01-21.
How severe is CVE-2021-47870?
Medium severity. CVSS v3 base score is 5.4 out of 10.