6.5
Medium
CVE-2022-29916 Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables
Description
Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Thunderbird 91.9 | earliest → < 91.9 | 91.9 |
| Firefox ESR 91.9 | earliest → < 91.9 | 91.9 |
| Firefox 100 | earliest → < 100 | 100 |
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