CVE-2026-56037
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 Themify Themify Popup allows Object Injection. This issue affects Themify Popup: from n/a through 1.4.3.
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 confidenceThis is a PHP Object Injection vulnerability caused by unsafe deserialization of untrusted data in the Themify Popup WordPress plugin. The plugin uses PHP's unserialize() function on user-controlled input without proper validation, allowing attackers to craft malicious serialized objects that can trigger magic method executions, potentially leading to arbitrary file inclusion, SQL injection, or remote code execution.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 Themify Popup plugin is installedNavigate to WordPress Admin > Plugins and locate Themify Popup in the list, or check for the /wp-content/plugins/themify-popup/ directory on the server filesystemAffected if The plugin directory themify-popup exists in the WordPress plugins folder
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Identify the installed plugin versionIn WordPress Admin > Plugins, click on Themify Popup to view the version number, or read the Version header from the main plugin PHP file in /wp-content/plugins/themify-popup/Affected if The installed version matches or falls within the affected vulnerable version range
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Confirm plugin is activeCheck WordPress Admin > Plugins to verify Themify Popup shows as Active, or query the WordPress database wp_options table for option_name = 'active_plugins' containing themify-popupAffected if The plugin is activated and handling requests
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Inspect for vulnerable unserialize usageSearch plugin PHP files for patterns like unserialize($_POST, unserialize($_GET, unserialize($_REQUEST, or similar calls that process superglobal input without sanitizationAffected if Code contains unserialize() calls directly on $_POST, $_GET, $_REQUEST or similar user-controlled input without validation
The environment is affected if Themify Popup plugin is installed and contains the insecure deserialization vulnerability where untrusted input is passed to PHP unserialize().
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 Themify Popup to the latest version immediately. If no patch is available, disable the plugin until a fix is released. As a temporary mitigation, ensure the site is not exposing any serialized data submissions through query parameters, POST data, or cookies that the plugin processes.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-56037 — 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-2026-56037 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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