CVE-2025-39503
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 · uneditedDeserialization of Untrusted Data vulnerability in GoodLayers Goodlayers Hotel gdlr-hotel allows Object Injection.This issue affects Goodlayers Hotel: from n/a through <= 3.1.4.
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 confidenceA deserialization vulnerability in the GoodLayers Hotel plugin (gdlr-hotel) for WordPress allows remote attackers to inject malicious PHP objects via untrusted data. This object injection can potentially lead to arbitrary code execution, file inclusion, or SQL injection depending on available 'magic methods' in the plugin or other installed plugins/themes.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Confirm GoodLayers Hotel plugin installationNavigate to WordPress admin dashboard > Plugins > Installed Plugins. Look for 'GoodLayers Hotel' or 'gdlr-hotel' in the list of installed plugins.Affected if Plugin is present in the plugins list
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Identify installed plugin versionIn the Plugins list, click on the plugin name or view the plugin details to find the version number. Alternatively, inspect the plugin header in /wp-content/plugins/gdlr-hotel/ folder via file manager or FTP.Affected if Version number is visible and can be compared to patched version
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Verify plugin is activeIn WordPress admin > Plugins, check if the GoodLayers Hotel plugin shows as 'Active'. Inactive plugins may still have vulnerable code but are not actively exploitable.Affected if Plugin status shows as Active
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Check for suspicious PHP object injection patternsReview web server access logs for unusual serialized data patterns in POST/GET requests to the site. Look for patterns containing 'O:' or 'a:' followed by numbers, which indicate PHP object serialization.Affected if Unusual serialized data found in request logs pointing to the site
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Inspect for unauthorized admin users or file changesIn WordPress admin > Users, check for unexpected administrator accounts. Via FTP/file manager, inspect plugin files for recently modified PHP files in the gdlr-hotel directory.Affected if New admin accounts exist or plugin files were recently modified without your knowledge
User is affected if the GoodLayers Hotel plugin is installed, active, and running an unpatched version susceptible to PHP object injection attacks.
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 dataUpdate the GoodLayers Hotel plugin to the latest patched version immediately. If no patched version is available, disable and remove the plugin until a fix is released, as the CVSS 9.8 indicates critical exploitable conditions.
- Consultation2.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-39503 — 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-2025-39503 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
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