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.
Published: 2026-09-01
Score: 6.4 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Stored Cross‑Site Scripting
Action: Immediate Patch
AI Analysis

Impact

The vulnerability exists in the Live Composer – Free WordPress Website Builder plugin, where the 'custom_id' attribute of the dslc_modules_section and dslc_modules_area shortcodes is concatenated into a div’s id attribute without sanitization. This allows an authenticated user with Contributor or higher roles to inject arbitrary scripts into pages that will execute when any user views those pages, enabling attacks such as session hijacking, cookie theft, or defacement. The weakness is a classic stored cross‑site scripting issue (CWE‑79).

Affected Systems

WordPress sites running the Live Composer plugin version 2.1.19 or earlier are affected. All installations of this plugin that have not been updated to a newer release are vulnerable.

Risk and Exploitability

The CVSS score of 6.4 indicates a moderate severity level. No EPSS score is available and the vulnerability is not listed in the CISA KEV catalog, but the attack vector requires authenticated Contributor-level access, meaning attackers who have been granted these credentials can exploit the flaw readily. Given the potential for widespread script execution on all users of the affected site, the risk remains significant and mitigation should be prioritized.

Generated by OpenCVE AI on September 1, 2026 at 05:51 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Update the Live Composer plugin to the latest version (2.1.20 or newer) to remove the vulnerable code.
  • If an immediate update is not possible, temporarily restrict or remove Contributor privileges from users, or disable the custom_id attribute in the affected shortcodes by editing the plugin template files or using a custom function that sanitizes the attribute.
  • Implement a Content Security Policy header that limits script sources to self and approved domains which can mitigate the impact of any leftover stored XSS injections.

Generated by OpenCVE AI on September 1, 2026 at 05:51 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 02 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 01 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Livecomposer
Livecomposer live Composer – Free Wordpress Website Builder
Wordpress
Wordpress wordpress
Vendors & Products Livecomposer
Livecomposer live Composer – Free Wordpress Website Builder
Wordpress
Wordpress wordpress

Tue, 01 Sep 2026 04:45:00 +0000

Type Values Removed Values Added
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.
Title Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_id' Shortcode Attribute
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

Subscriptions

Livecomposer Live Composer – Free Wordpress Website Builder
Wordpress Wordpress
cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-09-01T12:30:18.721Z

Reserved: 2026-06-24T14:06:30.279Z

Link: CVE-2026-13203

cve-icon Vulnrichment

Updated: 2026-09-01T12:30:15.514Z

cve-icon NVD

Status : Deferred

Published: 2026-09-01T05:17:08.713

Modified: 2026-09-01T20:47:54.130

Link: CVE-2026-13203

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T14:15:35Z

Weaknesses
  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')