(CBS SF / CNN)
Microsoft warns Windows 10 users to update their operating system immediately due to two "critical" vulnerabilities.
The company said the vulnerabilities are potentially "wormable", which means that computers that can be affected can spread viruses and malicious code without any user action.
There are "potentially hundreds of millions of vulnerable computers," Simon Pope, Microsoft's head of Incident Response, wrote in a blog post Tuesday.
"It is important that the affected systems are corrected as soon as possible because of the increased risks associated with sneaky vulnerabilities like these, and their downloads are in the Microsoft Security Update Guide," he says.
Other operating systems, such as Windows XP, are not affected.
Windows 10 is the world's most popular desktop operating system, according to Net Marketshare. Microsoft estimates that more than 800 million devices are running Windows 10.