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CVE-2021-47917

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

Published: Feb 1, 2026Updated: Feb 11, 2026 Sources: CVE List NVDCWE-79
6.4MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 79.0%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
No Fix Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

Simplephpscripts
aka simple cms, classified ads script
simple cms phpOn-prem
Web & CMS Plugins / cms-core
Simple CMSOn-prem
Web & CMS Plugins / cms-core

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

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

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