CVE-2021-47919Public exploitNetwork attack vector

Reflected XSS via unescaped preview ID

Published Feb 1, 2026 · Updated Feb 1, 2026

Reflected cross-site scripting in SimplePHPscripts Simple CMS PHP 2.1 allows remote attackers to execute script via preview.php?id. The preview.php exception path inserts the id value into an HTML error message without neutralizing markup, causing the victim's browser to execute the payload in the site's origin. The demonstrated request uses no account and requires victim navigation, while the CNA assessment indicates low privileges and no interaction.

CVSS severity6.4
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in SimplePHPscripts Simple CMS PHP 2.1 allows remote attackers to execute script via preview.php?id. The preview.php exception path inserts the id value into an HTML error message without neutralizing markup, causing the victim's browser to execute the payload in the site's origin. The demonstrated request uses no account and requires victim navigation, while the CNA assessment indicates low privileges and no interaction.

The record

CVE
CVE-2021-47919
Published
Feb 1, 2026
Updated
Feb 1, 2026
Vendor
SimplePHPscripts
Product
Simple CMS PHP
Classifications
CWE-79, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

SimplePHPscripts · Simple CMS PHPversion=2.1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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