Gutentype Object Injection: Critical Deserialization of Untrusted Data Affects Versions Through 2.1.12

The ThemeREX Group Gutentype plugin for WordPress contains a critical deserialization of untrusted data vulnerability. The National Vulnerability Database assigned CVE-2026-62046 to this issue, rating it at 9.8 on the Common Vulnerability Scoring System. Security teams must assess their environments immediately, as the flaw allows for object injection attacks against affected sites.

Root cause

The underlying weakness is classified as CWE-502, which denotes the deserialization of untrusted data. This occurs when an application processes serialized objects without verifying their integrity or origin. In this specific case, the Gutentype plugin fails to properly validate incoming data streams, creating a pathway for attackers to inject malicious objects into the application’s memory space.

Attack path

Attackers can exploit this deserialization flaw to perform object injection. By sending crafted data to the vulnerable plugin, threat actors can manipulate the application’s behaviour. The NVD record indicates that this issue allows object injection, which typically leads to remote code execution or other severe compromises. No complex authentication is required to trigger the initial deserialization process.

Affected versions

The vulnerability impacts all versions of the ThemeREX Group Gutentype plugin up to and including version 2.1.12. The NVD record specifies the affected range as "from n/a through 2.1.12". Organizations running any version within this scope are exposed to the CVE-2026-62046 risk. Sites using newer versions, if available, may not be affected, but verification is essential.

Mitigation

• Audit all WordPress installations to identify the presence of the Gutentype plugin.
• Check the installed version against the affected range of up to 2.1.12.
• Remove or disable the plugin if no secure update is available from the vendor.
• Monitor server logs for unusual deserialization attempts or object injection patterns.

What to do and how to stay safe: ThemeREX

• Inventory all third-party plugins and verify their current version numbers against known vulnerability databases.
• Restrict administrative access to WordPress dashboards to reduce the attack surface for unpatched components.
• Implement web application firewalls to detect and block suspicious deserialization payloads targeting known vulnerable endpoints.
• Review server access logs for signs of exploitation, such as unexpected object creation or unusual process spawning.

General security guidance from the Firewall Pulse newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is the CVSS score for CVE-2026-62046?

The National Vulnerability Database rates CVE-2026-62046 as 9.8, which is classified as critical severity.

Which versions of the Gutentype plugin are affected?

All versions of the ThemeREX Group Gutentype plugin from n/a through 2.1.12 are affected by this vulnerability.

What type of attack does this vulnerability enable?

The flaw allows for object injection through the deserialization of untrusted data, as described in the NVD record.