CVE-2026-12399

Name of the Vulnerable Software and Affected Versions Gutenverse versions prior to 3.8.1

Description The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress contains a Stored Cross-Site Scripting issue in the admin settings. This occurs due to insufficient input sanitization and output escaping, allowing authenticated attackers with editor-level permissions or higher to inject arbitrary web scripts into pages. These scripts execute when a user accesses the affected page. This issue specifically impacts multi-site installations and environments where unfiltered html has been disabled. The flaw is triggered via the fonts[].font.font.value parameter.

Recommendations Update the plugin to a version newer than 3.8.0.