Vulnerability Instance

Security researcher Mariusz Mlynski reported an issue with
spoofing of the location property. In this issue, writes to
location.hash can be used in concert with scripted history
navigation to cause a specific website to be loaded into the history object. The
baseURI can then be changed to this stored site, allowing an attacker to inject
a script or intercept posted data posted to a location specified with a relative
path.
In general these flaws cannot be exploited through email in the
Thunderbird and SeaMonkey products because scripting is disabled, but are
potentially a risk in browser or browser-like contexts in those products.