Liferay Portal vulnerable to user impersonation

In Liferay Portal 7.2.0 through 7.4.1, and older unsupported versions, and Liferay DXP 7.3 before service pack 3, 7.2 before fix pack 15, and older unsupported versions the doAsUserId URL parameter may get leaked when creating linked content using the WYSIWYG editor and while impersonating a user...