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CVE-2021-47917

6.4 · MEDIUM

Simple CMS 2.1 contains a persistent cross-site scripting vulnerability in user input parameters that allows remote attackers to inject malicious script code.

Published Feb 1, 2026CWE-79EPSS 0.33%

Overview

CVE-2021-47917 is a medium-severity vulnerability. It was published on February 1, 2026 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refsimplephpscripts.com/simple-cms-phpRefwww.vulncheck.com/advisories/simple-cms-persistent-cross-site-scripting-via-user-input-parametersRefwww.vulnerability-lab.com/get_content.php?id=2302

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47917?

CVE-2021-47917 is a medium-severity vulnerability. It was published on February 1, 2026 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2021-47917?

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47917?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47917?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47917 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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