The forum_print_latest_discussions function in mod/forum/lib.php in Moodle through 2.4.11, 2.5.x before 2.5.8, 2.6.x before 2.6.5, and 2.7.x before 2.7.2 allows remote authenticated users to bypass the individual answer-posting requirement without the mod/forum:viewqandawithoutposting capability, and discover an author's username, by leveraging the student role and visiting a Q&A forum.
https://moodle.org/mod/forum/discuss.php?d=269591
http://openwall.com/lists/oss-security/2014/09/15/1
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-46619