Project: 
CKEditor5 Youtube
Date: 
2025-June-25
Security risk: 
Moderately critical 14 ∕ 25 AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:All
Vulnerability: 
Cross-site Scripting
Affected versions: 
<1.0.4
CVE IDs: 
CVE-2025-6674
Description: 

The CKEditor5 Youtube module enhances content creation in Drupal by seamlessly integrating YouTube video embedding into the CKEditor 5 text editor.

The module doesn't sufficiently validate iframe sources under the scenario where a user embeds a video using the CKEditor YouTube integration leading to a Cross-site Scripting (XSS) vulnerabiity.
This vulnerability is mitigated by the fact that an attacker must have a role with necessary permissions to use CKEditor Youtube embed button.

Solution: 

Install the latest version:

  • If you are using the CKEditor5 YouTube module on Drupal 9.x or higher, you should upgrade to: CKEditor5 Youtube 1.0.4
Reported By: 
Fixed By: 
Coordinated By: