CVE-2026-16786
Received Received - Intake

Stored XSS in Live Composer WordPress Plugin

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Wordfence

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.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-16786
EUVD
EUVD-2026-68998

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
live_composer free_wordpress_website_builder to 2.1.19 (inc)

Helpful Resources

Exploitability

CWE
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KEV
KEV Icon
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

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Live Composer WordPress plugin. It allows authenticated attackers with contributor-level access or higher to inject malicious scripts via a shortcode. The scripts execute when users view the affected page because input sanitization and output escaping are insufficient.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Live Composer plugin up to version 2.1.19 for unauthorized use of the dslc_module_testimonials_output shortcode with suspicious payloads in fields like main_heading_title or view_all_link. Check server logs for unusual script injections in rendered pages.

Impact Analysis

An attacker could steal user sessions, redirect users to malicious sites, or perform actions on their behalf. This requires only contributor-level access, making it easier for attackers to exploit compared to higher-privilege roles.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR and HIPAA requirements for data protection and integrity. Organizations using the plugin may face compliance violations and potential fines.

Mitigation Strategies

Update the Live Composer plugin to the latest version beyond 2.1.19 to patch the vulnerability. Remove or disable the plugin if updates are unavailable. Review user roles with contributor-level access and above for unauthorized changes.

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