Gutentype Plugin Object Injection Vulnerability: CVSS 9.8 Threatens Versions Up to 2.1.12

The National Vulnerability Database has published details of a critical deserialization vulnerability in the ThemeREX Group Gutentype plugin for WordPress. Identified as CVE-2026-62046, the flaw permits object injection through the processing of untrusted data. Security teams should assess their WordPress installations immediately to determine if they are running affected versions of this widely used typography tool.

Root cause

The underlying weakness is classified as CWE-502, which denotes the deserialization of untrusted data. This occurs when an application processes serialized data without adequately verifying its integrity or origin before converting it back into objects. In this specific instance, the Gutentype plugin fails to validate incoming data streams, allowing an attacker to inject arbitrary objects into the application’s memory space during the deserialization process.

Attack path

An attacker exploits this vulnerability by supplying crafted data that the plugin attempts to deserialize. Because the application trusts this input without sufficient validation, the injected objects are instantiated within the WordPress environment. This object injection can lead to remote code execution or other severe impacts, depending on the specific objects created and the permissions of the WordPress user context under which the plugin operates.

Affected versions

The vulnerability impacts a broad range of plugin releases. According to the NVD record, the issue affects Gutentype from its earliest available versions through version 2.1.12. Any WordPress site running Gutentype version 2.1.12 or lower is considered vulnerable to this object injection attack. Sites running versions higher than 2.1.12 are not affected by this specific CVE, provided they are updated.

Mitigation

• Audit WordPress installations to identify if Gutentype is active.
• Check the plugin version against the affected range (up to 2.1.12).
• Remove the plugin if it cannot be updated to a patched version.
• Monitor web server logs for signs of exploitation attempts.

Background: National Vulnerability Database

The National Vulnerability Database provides standard identifiers for software flaws. You use these identifiers to automate patching and verify vendor claims. Small teams should cross-reference database entries with their IT asset inventory to prioritise fixes and avoid wasting time on irrelevant alerts.

Read the full guide: National Vulnerability Database: Small Business Action Plan

What to do and how to stay safe: Gutentype

• Review plugin inventories on all managed WordPress sites to locate Gutentype.
• Verify current plugin versions against the known affected range.
• Restrict access to administrative interfaces to reduce exposure.
• Monitor server logs for unusual activity indicative of object injection.

Step-by-step guide: Security Advisories: 6 Common Misreadings That Leave Systems Exposed

General security guidance from the Vector Bulletin 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 has assigned a CVSS score of 9.8, rating the severity as critical.

Which versions of Gutentype are vulnerable?

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

Is there a fix available for this vulnerability?

The source material does not confirm the release of a patched version; users should check for updates from the vendor.