The glitch affects versions 6 to 11 of Internet Explorer, which collectively account for more than 50 per cent of global web traffic.
The company has issued a security advisory regarding the flaw and says that it is currently exploring ways to fix the vulnerability.
“On completion of this investigation, Microsoft will take the appropriate action to protect our customers, which may include providing a solution through our monthly security update release process, or an out-of-cycle security update, depending on customer needs,” wrote the company.
The flaw is particularly hazardous on computers running the recently-discontinued Windows XP operating system. Microsoft ended security support for the 12-year-old software in April, warning users that the lack of updates would put computers running XP at severe risk to hackers and viruses.
It isn’t clear whether Microsoft will issue a fix for the flaw for Windows XP users or just for individuals running the more recent Vista, 7 and 8 operating systems.