When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10. A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue of when exiting fullscreen mode, an iframe could have confused the browser about the current state of the fullscreen, resulting in potential user confusion or spoofing attacks.
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