| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 99.0 | 99.0 |
| firefox esr | < 91.8 | 91.8 |
| thunderbird | < 91.8 | 91.8 |
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.
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