CVE-2026-0894: Vanderwijk Content Blocks Custom Post Widget

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The Content Blocks (Custom Post Widget) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's content_block shortcode in all versions up to, and including, 3.3.9 due to insufficient input sanitization and output escaping on user supplied values consumed from user-created content blocks. 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.

Affected products

• Vanderwijk Content Blocks Custom Post Widget: up to and including 3.3.9

Published 2026-04-18. Last modified 2026-06-17.