Content Blocks (Custom Post Widget), CVE-2026-0894

CVE, Research URL: CVE-2026-0894
Home page URL: Security reports for Content Blocks (Custom Post Widget)
Application: Content Blocks (Custom Post Widget)
Published on: Apr 18, 2026
Research Description: 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 versions: max 3.4.1.
Status: vulnerable