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Apple says on its support page that it “is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.1.” Tracked as CVE-2022-42856, the security issue in WebKit, which underpins Apple’s Safari browser, could lead to arbitrary code execution. But in the case of iOS 15.7.2, it’s important that you update straight away because it fixes a security flaw that is already being used in real-life attacks. I get it-you might be tempted to leave updating for a while to see if anyone else is getting bugs after upgrading to the new iOS version. iOS 15.7.2 and iOS 16.1.2 fix an already-exploited security flaw
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But this support was always going to be limited, and with iOS 15.7.2 being offered for older iPhones only, it appears time is up.
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