Description
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.
References6
- plugins.trac.wordpress.org/browser/live-composer-page-builder/t…
- plugins.trac.wordpress.org/browser/live-composer-page-builder/t…
- plugins.trac.wordpress.org/browser/live-composer-page-builder/t…
- plugins.trac.wordpress.org/browser/live-composer-page-builder/t…
- plugins.trac.wordpress.org/changeset?reponame=&old=3662813%40li…
- www.wordfence.com/threat-intel/vulnerabilities/id/852b1766-8674…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 29 · as of 8 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.