CVE-2025-39410
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 themegusta Smart Sections Theme Builder - WPBakery Page Builder Addon.This issue affects Smart Sections Theme Builder - WPBakery Page Builder Addon: from n/a through 1.7.8.
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 of untrusted data vulnerability in the Smart Sections Theme Builder WordPress plugin (WPBakery Page Builder addon) allows attackers to potentially execute arbitrary code via untrusted serialized data. The vulnerability affects versions through 1.7.8 and is exploitable remotely without authentication, earning a critical CVSS score.
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 Smart Sections Theme Builder plugin is installedLog into WordPress admin panel, navigate to Plugins > Installed Plugins, and locate 'Smart Sections Theme Builder' in the list. Alternatively, check the /wp-content/plugins/smart-sections-theme-builder/ directory exists on the server.Affected if The plugin is installed and active - this is a prerequisite for being affected.
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Check installed plugin versionIn WordPress admin panel, click on the plugin name to view its details and version number. Or inspect the main plugin file (usually smart-sections.php) and look for the 'Version:' comment header.Affected if Version is 1.7.8 or any earlier version - these contain the deserialization vulnerability.
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Confirm plugin is activeIn WordPress admin panel > Plugins, verify the Smart Sections Theme Builder shows as 'Active'. Or check the wp_options table for the option_name 'active_plugins' and verify the plugin is listed.Affected if Plugin is active - the vulnerability is exploitable only when the plugin code is loaded.
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Inspect for deserialization calls in plugin filesSearch plugin PHP files for 'unserialize' function calls, particularly those processing $_POST, $_GET, $_REQUEST or database values without validation. Check files in /wp-content/plugins/smart-sections-theme-builder/ directory.Affected if Unsanitized unserialize() calls are present processing external input - this is the vulnerable code pattern.
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Check for suspicious uploaded filesReview /wp-content/uploads/ and /wp-content/plugins/ directories for unfamiliar PHP files with random names, encoded content, or files modified recently outside normal updates.Affected if Unexpected PHP files exist - this may indicate successful exploitation of the deserialization flaw.
You are affected if the Smart Sections Theme Builder plugin is active and the installed version is 1.7.8 or earlier, as these versions contain the unauthenticated deserialization vulnerability.
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 to the latest version of the Smart Sections Theme Builder plugin as soon as possible. If exploitation is suspected, conduct a full security audit of the WordPress installation.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-39410 — 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-2025-39410 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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