When a worker is shutdown, it was possible to cause script to run late in the lifecycle, at a point after where it should not be possible. This vulnerability affects Firefox < 96, Thunderbird < 91.6, and Firefox ESR < 91.6.
| Software | From | Fixed in |
|---|---|---|
| mozilla / firefox | - | 96.0 |
| mozilla / firefox_esr | - | 91.6 |
| mozilla / thunderbird | - | 91.6 |