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.
| Software | From | Fixed in |
|---|---|---|
| mozilla / firefox_esr | - | 78.3 |
| mozilla / thunderbird | - | 78.3 |
| mozilla / firefox | - | 81.0 |
| debian / debian_linux | 9.0 | 9.0.x |
| debian / debian_linux | 10.0 | 10.0.x |
| opensuse / leap | 15.1 | 15.1.x |
| opensuse / leap | 15.2 | 15.2.x |