CVE-2026-12399: Jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor

Medium severity, CVSS 4.4. EPSS: 0.4% chance of exploitation in the next 30 days.

The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Affected products

• Jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor: up to and including 3.8.0

Published 2026-06-27. Last modified 2026-06-29.