Now officially on WordPress.org

CVE Database / CVE-2026-4658

CVE · Medium

CVE-2026-4658 — Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns [essential-blocks] < 6.1.0

CVE Vulnerability Type Severity Affected Fixed in Published Status
CVE-2026-4658 Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns [essential-blocks] < 6.1.0 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Medium 6.4 < 6.1.0 6.1.0 2026-05-01 —

CVE-2026-4658

The Essential Blocks plugin for WordPress contains a security flaw affecting all versions up to 6.0.4. The issue arises from the render_callback() function's failure to properly sanitize input when inserting className, classHook, and blockId attributes into HTML tags via sprintf() and implode(). As a result, authenticated users with Contributor-level access or higher can inject malicious scripts that will be executed whenever an affected page is accessed.

Based on public CVE data (MITRE/NVD).

Scan your WordPress site free

No signup, no credit card — enter your URL and get a security report in seconds.

Run a free scan Get the plugin (free)

See the full security page for this plugin Browse the CVE database Browse all security findings