[citation needed] Support for webarchive documents was added in Safari 4 Beta on Windows and is included in subsequent versions.
[3] Previously there was a third party iOS app called Web Archive Viewer that provided this functionality.
In February 2013, a vulnerability with the webarchive format was discovered and reported by Joe Vennix, a Metasploit Project developer.
The exploit allows an attacker to send a crafted webarchive to a user containing code to access cookies, local files, and other data.
Apple's response to the report was that it will not fix the bug, most likely because it requires action on the users' part in opening the file.