| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 79.0 | 79.0 |
| firefox esr | < 78.1 | 78.1 |
| thunderbird | < 78.1 | 78.1 |
When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
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