Drupal 6.x before 6.27 and 7.x before 7.18 displays information for blocked users, which might allow remote attackers to obtain sensitive information by reading the search results.
https://exchange.xforce.ibmcloud.com/vulnerabilities/80792
http://www.securityfocus.com/bid/56993
http://www.openwall.com/lists/oss-security/2012/12/20/1
http://www.mandriva.com/security/advisories?name=MDVSA-2013:074
http://www.debian.org/security/2013/dsa-2776
http://drupalcode.org/project/drupal.git/commitdiff/da8023a