What’s Vulnerable › Vulnerabilities

CVE-2026-13203: Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_id' Shortcode Attribute

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-01
• Weakness: CWE-79

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.

Affected products

• livecomposer Live Composer – Free WordPress Website Builder: through 2.1.19

References

• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1882
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1888
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L1922
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L2107
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.13/includes/display-functions.php#L2113
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1882
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1888
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L1922
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L2107
• https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.17/includes/display-functions.php#L2113
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3662813%40live-composer-page-builder&new=3662813%40live-composer-page-builder
• https://www.wordfence.com/threat-intel/vulnerabilities/id/9b9e0302-b981-4885-822f-063247bec4b2?source=cve

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