CVE-2026-13154: Unknown Gutenberg Essential Blocks

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The Gutenberg Essential Blocks WordPress plugin before 6.4.0 does not verify that an attacker-supplied post type is publicly viewable before querying it in one of its public REST routes, allowing unauthenticated users to read published entries of custom post types that the site registered as non-public.

Affected products

• Unknown Gutenberg Essential Blocks: before 6.4.0 (fixed in 6.4.0)

Published 2026-08-06. Last modified 2026-08-26.