A bug quietly reported on September 1 appears to have grave implications for Android users. Android Browser, the open source, WebKit-based browser that used to be part of the Android Open Source Platform (AOSP), has a flaw that enables malicious sites to inject JavaScript into other sites. Those malicious JavaScripts can in turn read cookies and password fields, submit forms, grab keyboard input, or do practically anything else.
Browsers are generally designed to prevent a script from one site from being able to access content from another site. They do this by...