CVE-2021-47917

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

CVSS 5.1 MEDIUMEPSS 0.3%CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.1EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

01 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Affected products

Simplephpscripts · Simple CMS

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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