A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.. A logic issue was found in WebKitGTK and WPE WebKit in versions prior to 2.30.6. A remote attacker may be able to cause arbitrary code execution. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center