CVE-2026-16778: 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 'dslc_module_downloads_output' Shortcode Content in all versions up to, and including, 2.1.21 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 save-time wp_kses_post check is bypassed because the payload is stored as a serialized string containing no HTML tags for kses to tokenize, and the shortcode callback re-emits attacker-controlled values — including view_all_link (href attribute), main_heading_title (h2 body), button_text (anchor body), and button_inline_svg (anchor body) — without any escaping at render time.

Affected products

• Livecomposer Live Composer – Free WordPress Website Builder: up to and including 2.1.21

Published 2026-09-22. Last modified 2026-09-22.