What is the CVSS score of CVE-2021-47919?

CVE-2021-47919 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 PHP are affected by CVE-2021-47919?

Organizations using Simple CMS 2.1 should be aware of moderate risk from CVE-2021-47919, a cross-site scripting vulnerability rated CVSS 6.4.

Is there a public PoC exploit available for CVE-2021-47919?

Yes, a public proof-of-concept exploit is available for CVE-2021-47919. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47919?

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

PHP CVE-2021-47919

MEDIUM

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

2026-02-01 disclosure@vulncheck.com

PHP 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 non-persistent cross-site scripting vulnerability in the preview.php file's id parameter. Attackers can inject malicious script code through a GET request to execute arbitrary scripts and potentially hijack user sessions or perform phishing attacks.

AnalysisAI

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Simple Cms Php. Simple CMS 2.1 contains a non-persistent cross-site scripting vulnerability in the preview.php file's id parameter. Attackers can inject malicious script code through a GET request to execute arbitrary scripts and potentially hijack user sessions or perform phishing attacks.

RemediationAI

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

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CVE-2021-47919 vulnerability details – vuln.today

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PHP CVE-2021-47919

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code