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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-39443

HIGH · 8.1 CVSS v3.1 Published 2026-06-17
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
90/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
Unauthenticated PHP Object Injection in EmallShop <= 2.4.21 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 confidence

This is an unauthenticated PHP Object Injection vulnerability in the EmallShop WooCommerce theme versions 2.4.21 and below. The flaw allows remote attackers to inject malicious PHP objects into the application's deserialization process without authentication, potentially leading to arbitrary code execution depending on available PHP classes in the application context.

MitigationUpgrade EmallShop to a version newer than 2.4.21, or implement input validation and avoid using unserialize() on untrusted user data. If immediate patching is not possible, disable the affected endpoint via web server configuration while a fix is developed.

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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm EmallShop theme is installed
    Locate the theme directory: wp-content/themes/emallshop or similar. Check for theme style.css file which contains version information in the header comments.
    Affected if The EmallShop theme files are present in the WordPress themes directory.
  2. Identify installed EmallShop version
    Open the theme's style.css file and look for the 'Version:' field in the file header. Alternatively, check the theme's functions.php for a version constant or variable.
    Affected if The reported version is 2.4.21 or any version number lower than 2.4.21.
  3. Verify the theme handles unserialize() on user input
    Search the theme's PHP files (particularly ajax handlers, action hooks, and any file processing code) for calls to unserialize() that process input from $_GET, $_POST, or $_REQUEST superglobals without validation.
    Affected if Code contains unserialize() applied directly to user-supplied data without prior sanitization or validation.
  4. Check for exposed theme AJAX endpoints
    If using WordPress, examine wp-admin/admin-ajax.php responses or frontend AJAX calls that route through the theme. Test whether the vulnerable parameter can be sent without authentication.
    Affected if Theme AJAX actions are accessible to unauthenticated users and accept serialized data parameters.

A user is affected if the EmallShop theme version is 2.4.21 or below AND the theme's codebase contains unserialize() calls processing unauthenticated user input.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade EmallShop to a version newer than 2.4.21, or implement input validation and avoid using unserialize() on untrusted user data. If immediate patching is not possible, disable the affected endpoint via web server configuration while a fix is developed.

Recommended fix Moderate confidence

EmallShop theme > 2.4.21 (latest available version)

  1. 1. Back up your WordPress site completely before making any changes
  2. 2. Update EmallShop theme to the latest available version from the official source (ThemeForest or the vendor directly)
  3. 3. If an immediate update is not available, consider disabling the theme or the affected component until a patch is released
  4. 4. Verify the update was successful and the vulnerability is resolved
  5. 5. Monitor for any unusual site behavior post-update
Caveat Minor CSS/customization adjustments may be needed after theme updates; always test on staging environment first

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-39443 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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