Same issue here on MacBook Pro with macOS Mojave version 10.14.6 (18G5006) after the Mojave security update. Both Safari and Mail can't load still. On my other machine running macOS Catalina version 10.15.5 Beta (19F53f) with Safari 13.1 (15609.2.1) and Mail 13.4 (3608.80.23.2.2) loads with no security issue.I tried reinstalling the macOS Mojave and for a few days, everything was running. Eventually the WebKit apps gets blocked again from loading. I guess I could use csrutil in Recovery mode, but I'd rather just use Safari Tech Preview for now.
haodo
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