Due to a layout change, iframe contents could have been rendered outside of its border. This could have led to user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8. The Mozilla Foundation Security Advisory describes this flaw as: Due to a layout change, iframe contents could have been rendered outside of its border. This could have led to user confusion or spoofing attacks.
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