DRUPAL-CORE-2021-011 The Drupal project uses the [CKEditor](https://github.com/ckeditor/ckeditor4) library for WYSIWYG editing.
Attackers with content creation rights can exploit XSS in CKEditor to target privileged users, potentially leading to 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-2021-011?
DRUPAL-CORE-2021-011 is a cross-site scripting vulnerability in drupal/core, published on 17 Nov 2021. 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, along with a hotfix for that update.
Vulnerabilities are possible if Drupal is configured to allow use of the CKEditor library for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit one or more Cross-Site Scripting (XSS) vulnerabilities to target users with access to the WYSIWYG CKEditor, including site admins with privileged access.
For more information, see CKEditor's security advisories:
- CVE-2021-41165: HTML comments vulnerability allowing to execute JavaScript code
- CVE-2021-41164: Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML
This advisory is not covered by Drupal Steward.
Which versions are affected by DRUPAL-CORE-2021-011?
1 open source package ship an affected version, including drupal/core.
| Package | Affected | Fixed in |
|---|---|---|
drupal/core Packagist | From 8.0.0 | 8.9.20, 9.1.14, 9.2.9 |
How do I fix DRUPAL-CORE-2021-011?
Upgrade drupal/core to a fixed version for your release line: 8.9.20, 9.1.14 or 9.2.9.
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-2021-011 being exploited?
There is no known exploitation of DRUPAL-CORE-2021-011 in the wild and no public exploit code.