Content Blocks (Custom Post Widget) <= 3.3.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via content_block Shortcode

6.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2024-3565
CVSS 6.4 (Medium)
Publicly Published May 31, 2024
Last Updated June 1, 2024
Researcher Alex Thomas - Wordfence

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, 3.3.0 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for Content Blocks (Custom Post Widget)

Software Type Plugin
Software Slug custom-post-widget (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.3.1, or a newer patched version
Affected Version
  • <= 3.3.0
Patched Version
  • 3.3.1

Recent vulnerabilities in Content Blocks (Custom Post Widget)

# Title CVE ID CVSS Researchers Date
1 Content Blocks (Custom Post Widget) <= 3.3.9 - Authenticated (Author+) Stored Cross-Site Scripting via content_block Shortcode CVE-2026-0894 6.4 Muhammad Yudha - DJ April 17, 2026
2 Content Blocks (Custom Post Widget) <= 3.3.5 - Authenticated (Contributor+) Stored Cross-Site Scripting via content Parameter CVE-2024-6432 6.4 lowol February 19, 2025
3 Content Blocks (Custom Post Widget) <= 3.3.5 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2024-44051 6.4 lowol September 5, 2024
4 Content Blocks (Custom Post Widget) <= 3.3.0 - Authenticated (Contributor+) Local File Inclusion via Shortcode CVE-2024-3564 8.8 Krzysztof Zając May 31, 2024
5 Content Blocks (Custom Post Widget) <= 3.3.0 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2024-34566 6.4 Ngô Thiên An (ancorn_) May 7, 2024

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