CVE-2026-13203
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 the 'custom_id' shortcode attribute of the dslc_modules_section and dslc_modules_area shortcodes in versions up to, and including, 2.1.19. This is due to insufficient input sanitization and output escaping on the user-supplied attribute, which is concatenated into the HTML id="" attribute of the rendered <div> element in the dslc_modules_section_front() and dslc_modules_area_front() functions without esc_attr(). 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.

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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-2026-13203
EUVD
EUVD-2026-68976

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
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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 the 'custom_id' shortcode attribute. The plugin fails to properly sanitize input and escape output, allowing the injected scripts to execute when users access affected pages.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Live Composer plugin versions up to 2.1.19. Check for malicious scripts in the 'custom_id' shortcode attribute of dslc_modules_section and dslc_modules_area shortcodes. Review rendered HTML for unsanitized input in div id attributes.

Impact Analysis

An attacker could steal user sessions, deface websites, or redirect visitors to malicious sites. Since it requires Contributor-level access, it primarily affects websites using the vulnerable plugin versions where untrusted users can submit content.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality requirements. For HIPAA, it may compromise protected health information if exploited on healthcare-related sites.

Mitigation Strategies

Update the Live Composer plugin to the latest version beyond 2.1.19. Remove or restrict Contributor-level access to untrusted users. Scan WordPress installations for injected scripts in shortcode attributes and sanitize all user inputs.

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