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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.
Base Score
6.5
| Base Score | 6.5 |
|---|---|
| Vector String | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
| Base Severity | Medium |
| Version | 3.1 |
| Attack Vector (AV) | NETWORK |
