New York (CNN Business)Microsoft is urging Windows users to immediately install an update after security researchers found a serious vulnerability in the operating system.
The security flaw, known as PrintNightmare, affects the Windows Print Spooler service. Researchers at cybersecurity company Sangfor accidentally published a how-to guide for exploiting it.
The researchers tweeted in late May that they had found vulnerabilities in Print Spooler, which allows multiple users to access a printer. They published a proof-of-concept online by mistake and subsequently deleted it — but not before it was published elsewhere online, including developer site GitHub.