Versions of Safari before 8.0.6, 7.1.6, and 6.2.6 are vulnerable to a "state management issue" that allows a browser window to be navigated to a file:// URL. By dropping and loading a malicious .webarchive file, an attacker can read arbitrary files, inject cross-domain Javascript, and silently install Safari extensions.
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Ubuntu Security Notice 2937-1 - A large number of security issues were discovered in the WebKitGTK+ Web and JavaScript engines. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.
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Apple Security Advisory 2015-06-30-1 - iOS 8.4 is now available and addresses denial of service, an incorrect issued certificate, arbitrary code execution, and various other flaws.
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Apple Security Advisory 2015-05-06-1 - Safari 8.0.6, Safari 7.1.6, and Safari 6.2.6 are now available and address memory corruption, information compromise, and unauthorized access vulnerabilities.
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