Credentials entered in private browsing mode were carried over to regular browsing which would reveal parts of the user's private browsing history. An issue existed in caching of HTTP authentication. CVE-2015-3754 : Cached authentication state may reveal private browsing history.This issue was addressed through improved canvas taint tracking. Images fetched through URLs that redirected to a data:image resource could have been exfiltrated cross-origin. CVE-2015-3753 : A malicious website may exfiltrate image data cross-origin.These issues were addressed through improved cookie handling. Cookies set during regular browsing were sent in private browsing. Cookies were sent in cross-origin report requests in violation of the standard. Two issues existed in how cookies were added to Content Security Policy report requests. CVE-2015-3752 : Content Security Policy report requests may leak cookies.This issue was addressed through improved Content Security Policy enforcement. An issue existed where websites with video controls would load images nested in object elements in violation of the website's Content Security Policy directive. CVE-2015-3751 : Image loading may violate a website's Content Security Policy directive.This issue was addressed through improved HTTP Strict Transport Security enforcement.

An issue existed where Content Security Policy report requests would not honor HTTP Strict Transport Security. CVE-2015-3750 : A malicious website may trigger plaintext requests to an origin under HTTP Strict Transport Security.These issues were addressed through improved memory handling. Multiple memory corruption issues existed in WebKit. The issue was addressed by displaying the prompt origin to the user. A malicious website could open another site and prompt for user input without a way for the user to tell where the prompt came from. CVE-2015-3729 : Visiting a malicious website may lead to user interface spoofing.

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