Project: 
Layout Builder iFrame Modal
Project machine name: 
layout_builder_iframe_modal
Date: 
2026-November-11
Security risk: 
Moderately critical 13 ∕ 25 AC:Complex/A:User/CI:Some/II:Some/E:Theoretical/TD:All
Vulnerability: 
Cross-site scripting
Affected versions: 
<1.3.9
CVE IDs: 
CVE-2026-126744
Description: 

This module renders Layout Builder forms inside an iframe in a modal dialog, using the admin theme.

The module provides its own Ajax command to open the iframe dialog. This command does not sanitize the dialog options the same way Drupal core does since SA-CORE-2026-001, which can lead to a cross-site scripting (XSS) vulnerability.

This vulnerability is mitigated by the fact that an attacker must be able to control the Ajax response, or be able to add markup with specific attributes to a page.

Solution: 

Install the latest version:

The fix relies on the dialog option sanitization added to Drupal core in SA-CORE-2026-001. Make sure the site also runs a Drupal core version that includes that fix (10.5.9, 10.6.7, 11.2.11, 11.3.7 or later).

Reported By: 
Fixed By: 
Coordinated By: