Moodle does not properly restrict access

The wiki subsystem in Moodle through 2.3.11, 2.4.x before 2.4.9, 2.5.x before 2.5.5, and 2.6.x before 2.6.2 does not properly restrict 1 view and 2 edit access, which allows remote authenticated users to perform wiki operations by leveraging the student role and using the Recent Activity block to...