According to the company, the major update addresses more than 120 vulnerabilities found in the previous 5.x branch.
Among the holes closed are problems in the handling of feed:// URLs could have led to cross-site scripting (XSS) attacks or users' files being sent to a remote server. A bug in the autocomplete system used by Safari, which may have resulted in passwords being automatically inserted even when a site specifies that it shouldn't be, has been fixed, as has an XSS issue caused by opening maliciously crafted files on certain pages.
A full list of security fixes can be found in Apple's security advisory. Users running Mac OS X 10.7.4 can upgrade to Safari 6 using the built-in Software update function. All users are advised to upgrade as soon as possible.
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