modules/openid/xrds.inc in Drupal 6.x before 6.33 and 7.x before 7.31 allows remote attackers to have unspecified impact via a crafted DOCTYPE declaration in an XRDS document.
https://www.drupal.org/SA-CORE-2014-004
http://www.debian.org/security/2014/dsa-2999
http://openwall.com/lists/oss-security/2014/08/16/4
http://cgit.drupalcode.org/drupal/diff/modules/openid/xrds.inc?id=1849830