Multiple serious vulnerabilities have been found in Apple Safari. Malicious users can exploit these vulnerabilities to bypass security restrictions, read arbitrary files or cause denial of service.

Below is a complete list of vulnerabilities

1. Improper page-loading and history implementations can be exploited remotely via a specially designed web site;
2. Unknown vulnerability can be exploited remotely via a specially designed web sites.

Apple Safari versions earlier than 6.2.6
Apple Safari 7 versions earlier than 7.1.6
Apple Safari 8 versions earlier than 8.0.6

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Apple advisory