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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefox | May 6, 2022 | May 4, 2022 |
| Alpine Linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-esrUpgrade librewolf | Aug 22, 2024 | Dec 22, 2022 |
| Centos_linux | — | Upgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debugsource | May 5, 2022 | May 4, 2022 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | May 6, 2022 | May 6, 2022 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin.Upgrade mail-client/thunderbird. | Aug 11, 2022 | Aug 10, 2022 |
| Mfsa2022 16 | — | Upgrade to Mozilla Firefox version 100.0Upgrade to the latest version of Mozilla Firefox | May 4, 2022 | May 3, 2022 |
| Mfsa2022 17 | — | Upgrade to Mozilla Firefox ESR version 91.9Upgrade to the latest version of Mozilla Firefox | May 4, 2022 | May 3, 2022 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 91.9 | May 6, 2022 | May 3, 2022 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | May 5, 2022 | May 3, 2022 |
| Redhat_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoNo solution existsUpgrade thunderbird-debuginfo | May 5, 2022 | May 4, 2022 |
| Rocky_linux | — | Upgrade thunderbird-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade firefoxUpgrade thunderbirdUpgrade firefox-debuginfo | Mar 5, 2024 | Dec 22, 2022 |
| Suse | — | Upgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-develUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird | Oct 26, 2022 | May 17, 2022 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | May 12, 2022 | May 4, 2022 |
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