A drupal security update has been released for Arch Linux.

ASA-202106-35: drupal: cross-site scripting

Arch Linux Security Advisory ASA-202106-35
=========================================
Severity: High
Date : 2021-06-15
CVE-ID : CVE-2021-33829
Package : drupal
Type : cross-site scripting
Remote : Yes
Link :   https://security.archlinux.org/AVG-2069

Summary
======
The package drupal before version 9.1.10-1 is vulnerable to cross-site
scripting.

Resolution
=========
Upgrade to 9.1.10-1.

# pacman -Syu "drupal>=9.1.10-1"

The problem has been fixed upstream in version 9.1.10.

Workaround
=========
None.

Description
==========
Drupal core uses the third-party CKEditor library. This library has an
error in parsing HTML that could lead to a cross-site scripting (XSS)
attack. CKEditor 4.16.1 and later, as bundled with Drupal 9.1.9,
include the fix.

Impact
=====
A remote attacker could execute arbitrary JavaScript code through
cross-site scripting using crafted HTML code.

References
=========
  https://www.drupal.org/sa-core-2021-003
  https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parser
  https://security.archlinux.org/CVE-2021-33829