Apple Inc. has said it plans to release a new feature called “Lockdown Mode” this fall that aims to add a new layer of protection for human rights advocates, political dissidents and other targets of sophisticated hacking attacks.

The move comes after at least two Israeli firms have exploited flaws in Apple’s software to remotely break into iPhones without the target needing to click or tap anything. NSO Group, the maker of the “Pegasus” software that can carry out such attacks, has been sued by Apple and placed on a trade blacklist by U.S. officials.

“Lockdown Mode” will come to Apple’s iPhones, iPads and Macs this fall and turning it on will block most attachments sent to the iPhone’s Messages app, according to a Reuters report.

Security researchers believe NSO Group exploited a flaw in how Apple handled message attachments. The new mode will also block wired connections to iPhones when they are locked. Israeli firm Cellebrite has used such manual connections to access iPhones.

Apple representatives said that they believe sophisticated attacks the new feature is designed to fight — called “zero click” hacking techniques — are still relatively rare and that most users will not need to active the new mode.