Joomla! before 1.5.23 does not properly check for errors, which allows remote attackers to obtain sensitive information via unspecified vectors.
developer.joomla.org/security/news/9-security/10-core-security/340-20110401-core-information-disclosure.html
secunia.com/advisories/44028
www.joomla.org/announcements/release-news/5367-joomla-1523-released.html
www.openwall.com/lists/oss-security/2011/06/20/17
www.openwall.com/lists/oss-security/2011/06/23/4
www.osvdb.org/71587