What’s Vulnerable › Vulnerabilities

CVE-2021-47917: Simple CMS 2.1 Persistent Cross-Site Scripting via User Input Parameters

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-01 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Simplephpscripts Simple CMS: 2.1

References

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

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