PT-2026-33600 · WordPress · Content Blocks

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

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Content Blocks (Custom Post Widget) plugin for WordPress versions prior to 3.4.0

Description Stored Cross-Site Scripting is possible via the content block shortcode due to insufficient input sanitization and output escaping on user supplied values consumed from user-created content blocks. Authenticated attackers with contributor-level access and above can inject arbitrary web scripts into pages, which execute when a user accesses the affected page.

Recommendations Update the plugin to a version later than 3.3.9.

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