The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefoxUpgrade thunderbird | May 4, 2022 | Dec 8, 2021 |
| Alpine Linux | — | Upgrade librewolfUpgrade firefox-esrUpgrade thunderbirdUpgrade firefox | Aug 22, 2024 | Dec 8, 2021 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Sep 30, 2022 | Dec 8, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Dec 8, 2021 |
| Centos_linux | — | Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade thunderbird | Nov 9, 2021 | Nov 3, 2021 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Dec 30, 2021 | Dec 8, 2021 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird. | Feb 22, 2022 | Dec 8, 2021 |
| Mfsa2021 48 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 94.0 | Nov 3, 2021 | Nov 2, 2021 |
| Mfsa2021 49 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 91.3 | Nov 3, 2021 | Nov 2, 2021 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 91.3Upgrade to the latest version of Mozilla Thunderbird | Nov 4, 2021 | Nov 3, 2021 |
| Oracle Solaris | — | Upgrade web/browser/firefox to version 91.3.0-11.4.40.0.1.107.1 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 91.3.0-11.4.40.0.1.107.1 on Solaris 11.4Upgrade mail/thunderbird to version 91.3.0-11.4.40.0.1.107.1 on Solaris 11.4 | Dec 13, 2021 | Dec 8, 2021 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Nov 4, 2021 | Nov 2, 2021 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-debuginfoNo solution existsUpgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade firefox | Nov 9, 2021 | Nov 3, 2021 |
| Rocky_linux | — | Upgrade firefoxUpgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefox-debugsource | May 5, 2022 | Dec 8, 2021 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbirdUpgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-devel | Nov 11, 2021 | Nov 3, 2021 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Nov 4, 2021 | Nov 3, 2021 |
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