Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing.
Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing.
https://www.mozilla.org/security/advisories/mfsa2021-48/ https://bugzilla.mozilla.org/show_bug.cgi?id=1718571
Vulmon