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Overview :
Drupal Views Builk Operations (VBO) module 6.x-1.0 through 6.x-1.10 does not properly escape the vocabulary help when the vocabulary has had user tagging enabled and the “Modify node taxonomy terms” action is used. A remote attacker could provide a specially-crafted URL that could lead to cross-site scripting (XSS) attack.
Affected Product(s) :
  • Drupal VBO module 6.x-1.0 through 6.x-1.10
Vulnerability Details :
CVE ID : CVE-2011-3373
It was found in the way Drupal Views Builk Operations (VBO) module did not escape the vocabulary help properly, when the vocabulary has had user tagging enabled and “Modify node taxonomy terms” action was used for modification of the taxonomy.

A remote attacker could provide a specially-crafted URL, which once visited by unsuspecting Drupal user, disposing with the ‘administer taxonomy’ permission, could lead to arbitrary HTML or web script execution (cross-site scripting [XSS] attack).

Solution :

Upgrage to 6.x-1.11
http://drupal.org/node/1286778