| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | ≥ 53.0, < 60.1.0< 61.0 | 60.1.061.0 |
| firefox esr | < 52.9 | 52.9 |
| thunderbird | ≥ 52.9.1, < 60.0< 52.9 | 60.052.9 |
A use-after-free vulnerability can occur when deleting an input element during a mutation event handler triggered by focusing that element. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.
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