Live Composer custom ID attributes permit stored cross-site scripting

Live Composer through 2.1.19 concatenates the custom_id attribute from dslc_modules_section and dslc_modules_area shortcodes into a rendered div id without esc_attr() in dslc_modules_section_front() and dslc_modules_area_front(). A Contributor or higher can break out of the attribute and store script that executes when another user views the page.

CVE / CNA score 6.4 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Live Composer – Free WordPress Website Builder
Plugin slug: live-composer-page-builder
Affected: <= 2.1.19
Safe version: See mitigation notes
Published: Sep 01, 2026
Weakness: CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Sep 01, 2026 and is one of 15 known issues for this plugin.

What to do

Update, patch or deactivate.

Update to a confirmed release newer than 2.1.19 when available. Until then, remove untrusted custom_id values, restrict affected shortcode use when warranted, and invalidate privileged sessions if affected pages were viewed.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical 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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References

Primary and upstream sources

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