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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-27338

HIGH · 8.8 CVSS v3.1 Published 2026-03-05
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable 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
Deserialization of Untrusted Data vulnerability in AivahThemes Car Zone carzone allows Object Injection.This issue affects Car Zone: from n/a through <= 3.7.

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 a PHP Object Injection vulnerability in the Car Zone theme by AivahThemes. The theme deserializes untrusted data without proper validation, allowing attackers to inject malicious PHP objects. If available gadget chains exist in the application or loaded libraries, this can lead to remote code execution.

MitigationAudit the codebase for unsafe unserialize() calls and replace with json_decode() or similar safe methods. Implement allowlist validation for any deserialized classes, and ensure all user input is validated before deserialization.

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 checks

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

  1. Identify if Car Zone theme is installed
    Check your WordPress theme directory (wp-content/themes/) for a folder named 'car-zone' or 'carzone', or inspect the theme via WordPress admin under Appearance > Themes
    Affected if The Car Zone theme by AivahThemes is present in the WordPress installation
  2. Locate the theme version
    Open the style.css file in the theme folder and look for the 'Version:' header in the comment block at the top, or check version.php if it exists
    Affected if The theme version cannot be determined or is any version of the Car Zone theme (no specific version range provided)
  3. Search for unsafe unserialize() calls
    Use grep or a file search to scan all PHP files in the theme folder for the pattern 'unserialize('
    Affected if Any PHP file in the theme contains an unserialize() call without prior validation
  4. Check if user input reaches unserialize
    Trace the data flow from common user input sources ($_GET, $_POST, $_REQUEST, $_COOKIE) to the identified unserialize() calls in the theme code
    Affected if User-controlled input is passed directly to unserialize() without sanitization or validation
  5. Identify loaded libraries for gadget chains
    Examine the theme for included libraries (check for composer.json, vendor folder, or included PHP libraries) and list all available classes that could serve as gadget chain candidates
    Affected if The theme or its dependencies contain classes that could be chained for RCE via PHP object injection

A user is affected if the Car Zone theme is installed AND contains unserialize() calls that process untrusted user input without class allowlist validation.

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

Audit the codebase for unsafe unserialize() calls and replace with json_decode() or similar safe methods. Implement allowlist validation for any deserialized classes, and ensure all user input is validated before deserialization.

Recommended fix Moderate confidence

Car Zone theme version > 3.7 (check ThemeForest or AivahThemes for the latest stable release)

  1. 1. Log into the WordPress admin dashboard
  2. 2. Navigate to Appearance > Themes
  3. 3. Deactivate the current Car Zone theme
  4. 4. Delete the vulnerable Car Zone theme
  5. 5. Install and activate the latest version of the Car Zone theme from a trusted source (ThemeForest or AivahThemes official source)
  6. 6. Verify the theme version is newer than 3.7 and that all functionality works correctly
Caveat Minor or major theme updates may require reconfiguration of custom settings, widgets, or child theme adjustments

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

Have this fixed Scoped from the published advisory
  • Consultation6.0 h
  • Implementation10.0 h
  • Testing6.0 h
  • Review / QA3.0 h
25.0 hours of engineering $4,440
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,104.

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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-2026-27338 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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