Bugzilla before 2.14 does not properly restrict access to confidential bugs, which could allow Bugzilla users to bypass viewing permissions via modified bug id parameters in (1) process_bug.cgi, (2) show_activity.cgi, (3) showvotes.cgi, (4) showdependencytree.cgi, (5) showdependencygraph.cgi, (6) showattachment.cgi, or (7) describecomponents.cgi.
bugzilla.mozilla.org/show_bug.cgi?id=39524
bugzilla.mozilla.org/show_bug.cgi?id=39526
bugzilla.mozilla.org/show_bug.cgi?id=39527
bugzilla.mozilla.org/show_bug.cgi?id=39531
bugzilla.mozilla.org/show_bug.cgi?id=39533
bugzilla.mozilla.org/show_bug.cgi?id=70189
bugzilla.mozilla.org/show_bug.cgi?id=82781
marc.info/?l=bugtraq&m=99912899900567
www.redhat.com/support/errata/RHSA-2001-107.html