Security researcher Mariusz Mlynski reported that the
location
property can be accessed by binary plugins through
top.location
and top
can be shadowed by
Object.defineProperty
as well. This can allow for possible
cross-site scripting (XSS) attacks through plugins.
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.