WPBakery Page Builder for WordPress <= 6.4 - Authenticated (Contributor+) Stored Cross-Site Scripting

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2020-28650
CVSS 6.4 (Medium)
Publicly Published October 7, 2020
Last Updated January 22, 2024
Researcher Chloe Chamberland - Wordfence


The WPBakery plugin for WordPress, in versions 6.4 and below, was designed with a flaw that could give users with contributor and author level roles the ability to inject malicious JavaScript into pages and posts. This flaw also gave these users the ability to edit other users’ posts. The plugin explicitly disabled any default post HTML filtering checks in the saveAjaxFe function using kses_remove_filters();. This meant that any user with access to the WPBakery builder could inject HTML and JavaScript anywhere in a post using the page builder.

Wordfence blocked 20 attacks targeting this vulnerability in the past 24 hours.



Vulnerability Details for WPBakery Page Builder for WordPress

Software Type Plugin
Software Slug js_composer
Patched? Yes
Remediation Update to version 6.4.1, or a newer patched version
Affected Version
  • <= 6.4
Patched Version
  • 6.4.1

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