CVE-2026-10833
Description
The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'configurablePrefix' Block Attribute in all versions up to, and including, 6.1.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Summary dbcve.org
The Gutenberg Essential Blocks WordPress plugin fails to properly sanitize the 'configurablePrefix' block attribute and escape it on output, allowing authenticated users with Contributor-level permissions or higher to inject persistent malicious JavaScript that executes when other users view affected pages.
Mitigation
Update the Gutenberg Essential Blocks plugin to a version beyond 6.1.4; alternatively, restrict contributor-level user permissions or disable the plugin until a patched version is available.