#35 History gives access to private categorized pages

[Jason Diceman]

e.g. http://virtualclinic.1org.ca/tiki-pagehistory.php?
page=Complete%20Team%20Contact%20List%
20PRIVATE&compare=1&oldver=10&newver=11&diff_sty
le=minsidediff

This page is only supposed to be visible to registered
group, according to the category permissions.

yikes