If you are unaware, the security standard HTTP Strict Transport Security (HSTS) can be abused as a ‘supercookie’ to surreptitiously track users of almost every modern web browser online without their knowledge even when they use “private browsing.” Apple has now added mitigations to its open-source browser infrastructure WebKit that underpins its Safari web browser to prevent HSTS abuse after discovering that theoretical attacks demonstrated in 2015 were recently deployed in the wild against Safari users.

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