| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 101 | 101 |
| firefox esr | < 91.10 | 91.10 |
| thunderbird | < 91.10 | 91.10 |
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.
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