GHSA-255J-QW47-WJH5 Craft CMS vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior

Note that attackers must have administrator access to the Craft Control Panel for this to work. Users should update to the patched versions 5.8.21 and 4.16.17 to mitigate the issue. Resources: https://github.com/craftcms/cms/commit/6e608a1a5bfb36943f94f584b7548ca542a86fef...