CVE-2023-3476
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 · uneditedA vulnerability was found in SimplePHPscripts GuestBook Script 2.2. It has been classified as problematic. This affects an unknown part of the file preview.php of the component URL Parameter Handler. The manipulation leads to cross site scripting. It is possible to initiate the attack remotely. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-232755.
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 · high confidenceA reflected Cross-Site Scripting (XSS) vulnerability exists in SimplePHPscripts GuestBook Script 2.2 within the preview.php file's URL parameter handler. Attackers can inject malicious JavaScript through unsanitized URL parameters, allowing execution in victim browsers when the preview functionality is accessed.
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= 2.2CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify GuestBook Script installation and versionLocate the SimplePHPscripts GuestBook Script files in your web root (commonly in a /guestbook/ directory). Check for a version.php file, readme.txt, or the main index.php for version information.Affected if The installed version is exactly 2.2
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Verify preview.php existsCheck for the presence of preview.php in the guestbook directory - typically found at /guestbook/preview.php or /preview.php within the guestbook installation.Affected if The file preview.php exists in the guestbook installation directory
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Confirm preview functionality is accessibleAccess the preview.php page through a web browser or curl request. If the page loads without requiring authentication, the feature is accessible to attackers.Affected if preview.php is accessible via HTTP without authentication or special configuration
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Test URL parameter handling for XSSSend a crafted request to preview.php with a test payload in the URL parameter, such as preview.php?test=<script>alert(1)</script>. Examine if the payload is reflected back unescaped in the response.Affected if URL parameter values are reflected in the page output without HTML encoding or sanitization
You are affected if SimplePHPscripts GuestBook Script version 2.2 is installed, preview.php is accessible, and URL parameters are reflected unescaped in the page output.
Generated from the published advisory. Verify against your own configuration.
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 dataUpgrade SimplePHPscripts GuestBook Script to the latest version to obtain the patched code. If immediate upgrade is not feasible, implement input validation and output encoding on all parameters in preview.php to neutralize XSS payloads.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2023-3476 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-3476 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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