CVE-2026-13203: Livecomposer Live Composer – Free WordPress Website Builder

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Livecomposer Live Composer – Free WordPress Website Builder: up to and including 2.1.19

Published 2026-09-01. Last modified 2026-09-01.