CVE-2021-47917CWE-79

Simple CMS 2.1 Persistent Cross-Site Scripting via User Input Parameters

Medium · published February 1, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
25.6
In the wild
Unconfirmed
What it is

Simple CMS 2.1 contains a persistent cross-site scripting vulnerability in user input parameters that allows remote attackers to inject malicious script code. Attackers can exploit the newUser and editUser modules to inject persistent scripts that execute on user list preview, potentially leading to session hijacking and application manipulation.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00334 · 25.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-01T12:15Z
EPSS history
Timeline
  • 01 FEB 12:15Z
    Simple CMS 2.1 Persistent Cross-Site Scripting via User Input Parameters
    cvelistv5