| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 81.0 | 81.0 |
| firefox esr | < 78.3 | 78.3 |
| thunderbird | < 78.3 | 78.3 |
Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
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