View online: https://www.drupal.org/sa-contrib-2025-081

Project: CKEditor5 Youtube [1] Date: 2025-June-25 Security risk: *Moderately critical* 14 ∕ 25 AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:All [2] Vulnerability: Cross-site Scripting

Affected versions: <1.0.3 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 1.0.3 [3]

Reported By:  * nico.b [4]

Fixed By:  * Brahim Khouy (b.khouy) [5] * Abderrahim GHAZALI 🤘 (g.abderrahim) [6] * nico.b [7]

Coordinated By:  * Greg Knaddison (greggles) [8] of the Drupal Security Team

[1] https://www.drupal.org/project/ckeditor5_youtube [2] https://www.drupal.org/security-team/risk-levels [3] https://www.drupal.org/project/ckeditor5_youtube/releases/1.0.3 [4] https://www.drupal.org/u/nicob [5] https://www.drupal.org/u/bkhouy [6] https://www.drupal.org/u/gabderrahim [7] https://www.drupal.org/u/nicob [8] https://www.drupal.org/u/greggles