CVE-2026-49763
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 · uneditedUnauthenticated PHP Object Injection in Integration for Contact Form 7 HubSpot <= 1.3.7 versions.
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 confidenceUnauthenticated PHP Object Injection vulnerability in the Contact Form 7 HubSpot WordPress plugin versions 1.3.7 and below. The plugin deserializes user-controlled input without proper sanitization, allowing remote attackers to inject malicious PHP objects. This can lead to remote code execution, arbitrary file operations, or database manipulation depending on available classes in the application environment.
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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Verify Contact Form 7 HubSpot plugin is installedIn WordPress admin, navigate to Plugins > Installed Plugins and locate 'Contact Form 7 HubSpot' in the list, or check the plugin files in wp-content/plugins/ for the contact-form-7-hubspot directoryAffected if The plugin is present in the WordPress installation
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Determine installed plugin versionIn the WordPress plugin list, click on the plugin to view details and find the version number, or read the main plugin PHP file header which contains the Version fieldAffected if Version is 1.3.7 or lower
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Identify if user input deserialization is exposedReview the plugin code for any endpoint that accepts user-controlled data and passes it to unserialize() function without validation. Common locations include AJAX handlers, REST API routes, or form submission handlers that process HubSpot API responsesAffected if The plugin contains code that directly deserializes request parameters, headers, or API responses without sanitization
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Check for unauthenticated access to vulnerable endpointDetermine if the deserialization endpoint can be reached without authentication. Test accessing plugin AJAX actions or API routes without providing credentialsAffected if The vulnerable code path is accessible to unauthenticated users
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Verify PHP environment has exploitable classesReview installed PHP classes that could be chainable with the injected object (such as custom classes that perform file operations or database queries)Affected if PHP application has classes that could be leveraged for code execution or data manipulation when instantiated with malicious properties
A user is affected if the Contact Form 7 HubSpot plugin versions 1.3.7 or below is installed and the plugin contains code that deserializes unauthenticated user input without validation.
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 Contact Form 7 HubSpot plugin to the latest patched version immediately. If no patched version is available, disable the plugin and consider alternative solutions until a fix is released.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
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Free · runs locallyCheck whether your project pulls in CVE-2026-49763 — 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-2026-49763 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