Apple has released security updates for a newly discovered zero-day vulnerability that affects every iPhone, iPad, Mac and Apple Watch. Citizen Lab, which discovered the vulnerability and was credited with the find, urges users to immediately update their devices.

The technology giant said iOS 14.8 for iPhones and iPads, as well as new updates for Apple Watch and macOS, will fix at least one vulnerability that it said “may have been actively exploited.”

Citizen Lab said it has now discovered new artifacts of the ForcedEntry vulnerability, details it first revealed in August as part of an investigation into the use of a zero-day vulnerability that was used to silently hack into iPhones belonging to at least one Bahraini activist.

Last month, Citizen Lab said the zero day flaw — named as such since it gives companies zero days to roll out a fix — took advantage of a flaw in Apple’s iMessage, which was exploited to push the Pegasus spyware, developed by Israeli firm NSO Group, to the activist’s phone. The breach was significant because the flaws exploited the latest iPhone software at the time, both iOS 14.4 and later iOS 14.6, which Apple released in May. But also the vulnerabilities broke through new iPhone defenses that Apple had baked into iOS 14, dubbed BlastDoor, which were supposed to prevent silent attacks by filtering potentially malicious code. Citizen Lab calls this particular exploit ForcedEntry for its ability to skirt Apple’s BlastDoor protections.

In its latest findings, Citizen Lab said it found evidence of the ForcedEntry exploit on the iPhone of a Saudi activist, running at the time the latest version of iOS. Citizen Lab now says that the same ForcedEntry exploit works on all Apple devices running, until today, the latest software.

Citizen Lab said it reported its findings to Apple on September 7. Apple pushed out the updates for the vulnerability, known officially as CVE-2021-30860. Citizen Lab said it attributes the ForcedEntry exploit to NSO Group with high confidence, citing evidence it has seen that it has not previously published.

When reached, Apple declined to comment. NSO Group did not immediately comment.

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