In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
CVSS Details
- CVSS 3.1 Base Score: 6.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade librewolfUpgrade firefox-esr | Jan 4, 2021 | Dec 9, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Jan 8, 2021 | Dec 9, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Dec 9, 2020 |
| Centos_linux | — | Upgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbird | Dec 1, 2020 | Nov 30, 2020 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Nov 20, 2020 | Nov 20, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin.Upgrade mail-client/thunderbird. | Dec 7, 2020 | Dec 7, 2020 |
| Mfsa2020 50 | — | Upgrade to Mozilla Firefox version 83.0Upgrade to the latest version of Mozilla Firefox | Nov 18, 2020 | Nov 17, 2020 |
| Mfsa2020 51 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 78.5 | Nov 18, 2020 | Nov 17, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 78.5Upgrade to the latest version of Mozilla Thunderbird | Nov 18, 2020 | Nov 17, 2020 |
| Oracle Solaris | — | Upgrade mail/thunderbird to version 78.5.0-11.4.28.0.1.82.2 on Solaris 11.4Upgrade web/browser/firefox to version 78.5.0-11.4.28.0.1.82.2 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 78.5.0-11.4.28.0.1.82.2 on Solaris 11.4 | Jan 19, 2021 | Dec 9, 2020 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Dec 1, 2020 | Nov 17, 2020 |
| Redhat_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsourceNo solution existsUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-debugsource | Dec 1, 2020 | Nov 30, 2020 |
| Suse | — | Upgrade MozillaFirefox-develUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbirdUpgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-translations-commonUpgrade mozillafirefox-branding-upstream | Nov 25, 2020 | Nov 18, 2020 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Nov 19, 2020 | Nov 18, 2020 |
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