The PlushSearch2 function in Search.php in Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, uses certain cached data in a situation where a temporary table has been created, even though this cached data is intended only for situations where a temporary table has not been created, which might allow remote attackers to obtain sensitive information via a search.
http://www.simplemachines.org/community/index.php?topic=421547.0
http://www.openwall.com/lists/oss-security/2011/03/02/4
http://www.openwall.com/lists/oss-security/2011/02/22/17
http://custom.simplemachines.org/mods/downloads/smf_patch_2.0-RC4_security.zip