Changelog #9

Drupal core uses the third-party CKEditor library. This library has an error in parsing HTML that could lead to an XSS attack. CKEditor 4.16.1 and later include the fix.

Please update your site(s) as soon as possible to avoid any issues.

Description:
Drupal core uses the third-party CKEditor library. This library has an error
in parsing HTML that could lead to an XSS attack. CKEditor 4.16.1 and later
include the fix.

Users of the CKEditor library via means other than Drupal core should update
their 3rd party code (e.g. the WYSIWYG module for Drupal 7). The Drupal
Security Team policy is not to alert for issues affecting 3rd party libraries
unless those are shipped with Drupal core. See DRUPAL-SA-PSA-2016-004 for
more details [3].

This issue is mitigated by the fact that it only affects sites with CKEditor
enabled.

Read more about the release: https://www.drupal.org/sa-core-2021-003

Changelog #9

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