CVE-2021-47917

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

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.

Affected

Simplephpscripts · Simple CMS

CVSS v4.0 VULNCHECK

5.1 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

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

CVSS v3.1 VULNCHECK

6.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS

0.33% chance of exploitation in the next 30 days, 25th percentile

Published

2026-02-01

Updated

2026-03-05

Proof-of-concept exploits (1)

• https://www.vulnerability-lab.com/get_content.php?id=2302

Security advisories

• https://www.vulncheck.com/advisories/simple-cms-persistent-cross-site-scripting-via-user-…
• https://simplephpscripts.com/simple-cms-php

References

• CVE Record
• NVD entry