| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 84.0 | 84.0 |
| firefox esr | < 78.6.0 | 78.6.0 |
| thunderbird | < 78.6.0 | 78.6.0 |
Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
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