What the vulnerability does
01Description
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via dslc_module_testimonials_output Shortcode in all versions up to, and including, 2.1.19 due to insufficient input sanitization and output escaping. 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. The injected payload survives save-time wp_kses_post filtering because KSES treats shortcode delimiters as opaque, and the unescaped fields — including main_heading_title, view_all_link, main_heading_link_title, and main_filter_title_all — are only rendered when do_shortcode() executes at page-view time.
Explanation of Vulnerability in Simple Terms
02Summary
Live Composer contains a stored cross-site scripting (XSS) vulnerability in versions up to 2.1.19. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site visitors, potentially compromising their sessions or stealing data. The vulnerability affects the site scope, meaning the injected code can impact multiple areas of the WordPress installation.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers when they view affected pages.
Potential impact on your site
04Site Impact
Visitors and admins may have their sessions hijacked, credentials stolen, or be redirected to malicious sites.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege WordPress user account (e.g., contributor or subscriber role).
Key dates
06Disclosure timeline
September 1, 2026
CVE published
September 1, 2026
Record updated
