What the vulnerability does
01Description
The Premium Addons for KingComposer plugin for WordPress is vulnerable to unauthorized modification and loss of data in versions up to, and including, 1.1.1. This is due to missing authorization and capability checks on the add_custom_sidebar() and remove_custom_sidebar() AJAX handlers, both of which are exposed through wp_ajax_nopriv_* hooks and write directly to the octagon_custom_sidebar option via update_option(). This makes it possible for unauthenticated attackers to create arbitrary custom widget areas or delete existing custom sidebars, which can cause widgets assigned to those areas to silently lose their registration and stop rendering.
Explanation of Vulnerability in Simple Terms
02Summary
Premium Addons for KingComposer versions 1.1.1 and earlier lack proper authorization checks, allowing unauthenticated attackers to modify site content or settings. The vulnerability requires only network access and no user interaction. Site administrators should update to a version newer than 1.1.1 immediately.
What an attacker can do
03Attacker Capabilities
Modify site content or settings without logging in.
Potential impact on your site
04Site Impact
Unauthorized changes to site content, settings, or data integrity without any warning or audit trail.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
June 30, 2026
CVE published
