DEBIAN-CVE-2022-28286

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...

Mozilla: Iframe contents could be rendered outside the iframe

The Mozilla Foundation Security Advisory describes this flaw as: Use tables inside of an iframe, an attacker could have caused iframe contents to be rendered outside the boundaries of the iframe, resulting in potential user confusion or spoofing attacks...