The recently reported Internet Explorer vulnerability is serious enough to have even rattled the Department of Homeland Security. In a notice on its website, the Department recommended that users "enable Microsoft EMET where possible" and pressing Windows XP users to "employ a different browser." The flaw allows hackers to remotely control computers through a security hole that affects Internet Explorer 6 through 11, and has been dubbed "Operation Clandestine Fox" by the security firm FireEye (who initially discovered it).
Homeland Security never usually issues computer software-related alerts, proving the significance of this threat. It is worth nothing that many government agencies use versions of Internet Explorer. We cannot overstate how important it is to implement the department's recommendations, especially as far as XP users are concerned. A patch will come for other users, but XP users will not have the same luxury.