CVE-2021-47917

MEDIUM 6.4

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

CVSS Score

6.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	simplephpscripts
Product	simple cms
Published	Feb 1, 2026
Last Updated	Mar 5, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Simplephpscripts / Simple CMS

2.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vulnerability-lab.com: https://www.vulnerability-lab.com/get_content.php?id=2302 simplephpscripts.com: https://simplephpscripts.com/simple-cms-php vulncheck.com: https://www.vulncheck.com/advisories/simple-cms-persistent-cross-site-scripting-via-user-input-parameters

Credits

Vulnerability-Lab [Research Team]