Advanced Electron Forum (AEF) 1.0.8 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by languages/english/deletetopic_lang.php.
http://www.openwall.com/lists/oss-security/2011/06/27/6
http://code.google.com/p/inspathx/source/browse/trunk/paths_vuln/aef-1.0.8