PT-2026-33600 · Vanderwijk · Content Blocks

Published 2026-04-18 · Updated 2026-04-18 · CVE-2026-0894

Mitre

CVSS v3.1

6.4

Medium

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-0894

Affected Products

Content Blocks

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-0894 · Security Note
• https://wordfence.com/threat-intel/vulnerabilities/id/246dee15-82e0-4630-8d95-d2419e9eaef8?source=cve · Note
• https://twitter.com/CVEnew/status/2045467312707326193 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2045452610618929366 · Twitter Post
• https://plugins.trac.wordpress.org/changeset/3447914/custom-post-widget · Note