The Enhanced Image (aka image2) plugin for CKEditor in versions 4.5.10 through 4.9.1; fixed in 4.9.2, and as used in Drupal 8 before 8.4.7 and 8.5.x before 8.5.2 and other products, is vulnerable to cross-site scripting because it allows remote attackers to inject arbitrary web script through a crafted IMG element.
www.securityfocus.com/bid/103924
github.com/ckeditor/ckeditor-dev/blob/master/CHANGES.md
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2018-9861.yaml
github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2018-9861.yaml
nvd.nist.gov/vuln/detail/CVE-2018-9861
www.drupal.org/sa-core-2018-003
www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html