What is the CVSS score of CVE-2021-47917?

CVE-2021-47917 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Simple Cms Php are affected by CVE-2021-47917?

Organizations using Simple CMS 2.1 should be aware of moderate risk from CVE-2021-47917, a cross-site scripting vulnerability rated CVSS 6.4.

Is there a public PoC exploit available for CVE-2021-47917?

Yes, a public proof-of-concept exploit is available for CVE-2021-47917. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47917?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Simple Cms Php CVE-2021-47917

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-01 disclosure@vulncheck.com

XSS Simple Cms Php

6.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:01 vuln.today

PoC Detected

Feb 11, 2026 - 19:30 vuln.today

Public exploit code

CVE Published

Feb 01, 2026 - 13:15 nvd

MEDIUM 6.4

DescriptionCVE.org

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.

AnalysisAI

Simple CMS 2.1 contains a persistent cross-site scripting vulnerability in user input parameters that allows remote attackers to inject malicious script code. [CVSS 6.4 MEDIUM]

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the user input component of Simple Cms Php. 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.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

CVE-2021-47917 vulnerability details – vuln.today

Back