A newly discovered security hole in Microsoft Corp.’s MSFT +0.13% Internet Explorer—the default Web browser for many users—could be particularly troubling for those still running Windows XP.

Microsoft on Sunday warned about a flaw affecting versions 6 through 11 of its flagship browser. The coding flaw would allow hackers to have the same level of access on a network computer as the official user, Microsoft said, which is a best-case scenario for intruders.

The company said it is aware of “limited, targeted attacks” that attempt to exploit the flaw. Microsoft didn’t elaborate.Read more…