CVE-2023-3539Public exploitNetwork attack vector

Reflected XSS via unescaped preview parameters

Published Jul 7, 2023 · Updated Aug 2, 2024

Reflected XSS in SimplePHPscripts Simple Forum PHP 2.7 allows remote attackers to execute script through preview.php parameters. The preview.php response inserts attacker-controlled path data or the GET p parameter into HTML without neutralizing script markup. A victim must follow a crafted link; the injected script then runs in the site's browser context and can alter displayed content or expose session data.

CVSS severity6.1
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in SimplePHPscripts Simple Forum PHP 2.7 allows remote attackers to execute script through preview.php parameters. The preview.php response inserts attacker-controlled path data or the GET p parameter into HTML without neutralizing script markup. A victim must follow a crafted link; the injected script then runs in the site's browser context and can alter displayed content or expose session data.

The record

CVE
CVE-2023-3539
Published
Jul 7, 2023
Updated
Aug 2, 2024
Vendor
SimplePHPscripts
Product
Simple Forum PHP
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

SimplePHPscripts · Simple Forum PHPversion=2.7

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1204.001User Execution: Malicious Link

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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