typeswidget.py in Plone 2.1 through 4.1, 4.2.x through 4.2.5, and 4.3.x through 4.3.1 does not properly enforce the immutable setting on unspecified content edit forms, which allows remote attackers to hide fields on the forms via a crafted URL.
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.