---
id: CVE-2026-16778
title: >-
  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 in…
summary: >-
  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 in…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: livecomposer
product: Live Composer – Free WordPress Website Builder
affected:
  - live_composer_free_wordpress_website_builder <= 2.1.21
published: '2026-09-22'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:04:55.677'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16778'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L4978
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5219
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5225
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5502
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5508
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/downloads/module.php#L5685
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3705127%40live-composer-page-builder&new=3705127%40live-composer-page-builder
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/1d072660-515c-4fd9-903b-815447786e03?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T10:10:02.332597Z'
ingestedAt: '2026-09-22T08:00:27.696Z'
epss: 0.00221
epssPercentile: 0.11232
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.