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Newsletter Script PhpApplication · Simplephpscripts

CVE-2023-3540

MEDIUM · 6.1 CVSS v3.1 Published 2023-07-07
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability, which was classified as problematic, was found in SimplePHPscripts NewsLetter Script PHP 2.4. Affected is an unknown function of the file /preview.php of the component URL Parameter Handler. The manipulation leads to cross site scripting. It is possible to launch the attack remotely. The identifier of this vulnerability is VDB-233292.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A cross-site scripting (XSS) vulnerability exists in SimplePHPscripts NewsLetter Script PHP 2.4 in the /preview.php file. The vulnerability stems from improper handling of URL parameters, allowing attackers to inject malicious JavaScript code that executes in the context of other users' browsers.

MitigationImplement proper input validation and output encoding for all user-supplied data in preview.php. Use context-appropriate encoding and consider implementing Content Security Policy headers to mitigate XSS risks.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Newsletter Script PhpApplication
Affected:= 2.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify if SimplePHPscripts NewsLetter Script is installed
    Search your web server directories for files containing 'SimplePHPscripts' or 'Newsletter' in the filename or code, or look for the characteristic folder structure of this PHP script.
    Affected if The script is present on the server in any accessible web directory.
  2. Verify the exact version of the installed script
    Check the script's version file, header comments in PHP files, or any version metadata file typically distributed with the software.
    Affected if The installed version is exactly 2.4 (no other versions are listed as affected by this CVE).
  3. Confirm the presence of preview.php
    Locate the preview.php file within the web accessible directory where the Newsletter Script is installed.
    Affected if The preview.php file exists and is accessible via the web server.
  4. Determine if URL parameters are processed by preview.php
    Examine the preview.php source code to see if it reads and uses URL parameters (such as via $_GET, $_REQUEST, or similar superglobals) without sanitization.
    Affected if preview.php processes URL parameters and displays them in the page output without proper encoding.
  5. Test for reflected XSS behavior (if authorized)
    If you have authorization, send a benign test string (such as <script>alert(1)</script>) as a URL parameter to preview.php and observe if the script tag appears unescaped in the response.
    Affected if The test string appears literally in the HTML output without being escaped, indicating the vulnerability is present.

You are affected if SimplePHPscripts NewsLetter Script version 2.4 is installed and the preview.php file processes URL parameters without proper sanitization, allowing injected script content to be reflected back to users.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper input validation and output encoding for all user-supplied data in preview.php. Use context-appropriate encoding and consider implementing Content Security Policy headers to mitigate XSS risks.

Fix this in Newsletter Script Php Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-3540 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data