Apple says its security flaw was fixed. Cyber analysts warn zero-click threats will persist

Cybersecurity analysts are urging Apple users to immediately update the software of their phones, computers and watches after the company issued an emergency security patch on Monday to prevent hackers from gaining access to the devices without the users knowing. 

In a new report, researchers at the University of Toronto's Citizen Lab said the NSO Group, an Israeli spyware company, used what is known as a "zero-click exploit" to access the phone of an unnamed Saudi activist. Researchers at Citizen Lab called the exploit "Forcedentry'' and said it has been in use since February. They also revealed that the NSO Group's flagship "Pegasus" spyware program was used to infect the activist's device.

"Whereas typical cyberattacks require a user to engage with a malicious piece of content - such as clicking on a rogue link - zero click exploits do not require any sort of interaction with devices' owners themselves," Lisa Plaggemier, interim executive director of the National Cyber Security Alliance, told CBS News. "This means it is virtually impossible for individuals to know if they have been compromised or not," she added.