DRUPAL-CORE-2026-013 The Drupal project uses the [CKEditor](https://github.com/ckeditor/ckeditor5) library for WYSIWYG editing.
An attacker with content creation privileges can exploit an XSS vulnerability in CKEditor to target site administrators, potentially leading to privilege escalation or account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is DRUPAL-CORE-2026-013?
DRUPAL-CORE-2026-013 is a cross-site scripting vulnerability in drupal/core, published on 16 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
The Drupal project uses the CKEditor library for WYSIWYG editing. CKEditor has released a security update that impacts Drupal.
Vulnerabilities are possible if Drupal is configured to use CKEditor for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit this Cross-Site Scripting (XSS) vulnerability to target users with access to the WYSIWYG CKEditor, including site admins with privileged access.
For more information, see CKEditor's security advisory:
Which versions are affected by DRUPAL-CORE-2026-013?
1 open source package ship an affected version, including drupal/core.
| Package | Affected | Fixed in |
|---|---|---|
drupal/core Packagist | From 10.5.0 | 10.6.17, 11.3.17, 11.4.7 |
How do I fix DRUPAL-CORE-2026-013?
Upgrade drupal/core to a fixed version for your release line: 10.6.17, 11.3.17 or 11.4.7.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is DRUPAL-CORE-2026-013 being exploited?
There is no known exploitation of DRUPAL-CORE-2026-013 in the wild and no public exploit code.