class.vfs_dav.inc.php in phpGroupWare 0.9.16.000 does not create .htaccess files to enable authorization checks for access to users' home-directory files, which allows remote attackers to obtain sensitive information from these files.
phpGroupWare before 0.9.16.002 transmits the (1) header admin and (2) setup passwords in plaintext via cookies, which allows remote attackers to sniff passwords.
phpGroupWare 0.9.14.005 and earlier allow remote attackers to obtain sensitive information via a direct request to (1) hook_admin.inc.php, (2) hook_home.inc.php, (3) class.holidaycalc.inc.php, and (4) setup.inc.php.sample, which reveals the path in an error message.
phpGroupWare 0.9.16.003 and earlier allows remote attackers to gain sensitive information via (1) unexpected characters in the session ID such as shell metacharacters, (2) an invalid appname parameter to preferences.php or (3) an invalid menuaction parameter to index.php, which reveals the web server path in an error message.