CVE 2009-3568
Comment RSS 5.x before 5.x-2.2 and 6.x before 6.x-2.2, a module for Drupal, does not properly enforce permissions when a link is added to the RSS feed, which allows remote attackers to obtain the node title and possibly other sensitive content by reading the feed.
See the 
CVE page on Mitre.org
for more details.
