CVE-2026-0894
Received Received - Intake
Stored XSS in WordPress Content Blocks Plugin Allows Script Injection

Publication date: 2026-04-18

Last updated on: 2026-04-18

Assigner: 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, 3.3.9 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.
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Meta Information
Published
2026-04-18
Last Modified
2026-04-18
Generated
2026-06-16
AI Q&A
2026-04-18
EPSS Evaluated
2026-06-14
NVD
CVE-2026-0894
EUVD
EUVD-2026-23670
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wpengine content_blocks to 3.3.9 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

The vulnerability exists in the Content Blocks (Custom Post Widget) plugin for WordPress, specifically in versions up to and including 3.3.9. It is a Stored Cross-Site Scripting (XSS) issue caused by insufficient input sanitization and output escaping of user-supplied values within the plugin's content_block shortcode.

This means that authenticated users with contributor-level access or higher can inject malicious scripts into content blocks. These scripts will then execute whenever any user accesses the affected page.

Impact Analysis

This vulnerability allows attackers with contributor-level access or above to inject arbitrary web scripts into pages. When other users visit these pages, the malicious scripts execute in their browsers.

  • It can lead to theft of user credentials or session tokens.
  • It may enable attackers to perform actions on behalf of other users.
  • It can result in defacement or manipulation of website content.
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