"Clear History and Website Data" did not clear the history. The issue was addressed with improved data deletion. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, iOS 14.3 and iPadOS 14.3, tvOS 14.3. A user may be unable to fully delete browsing history. A flaw was found in WebKitGTK and WPE WebKit in versions prior to 2.30.6. A user may be unable to fully delete the browsing history under some circumstances. The highest threat from this vulnerability is to data confidentiality.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center