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When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer does not escape < and > characters. Because the resulting string is pasted directly into the text node of the element this does not result in a direct injection into the webpage; however, if a webpage subsequently copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability. Two WYSIWYG editors were identified with this behavior, more may exist. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade librewolfUpgrade firefoxUpgrade firefox-esr | Jun 11, 2020 | Jan 8, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Apr 27, 2020 | Jan 8, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jan 8, 2020 |
| Centos_linux | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade firefox | Jan 14, 2020 | Jan 8, 2020 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jan 13, 2020 | Jan 8, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade www-client/firefox. | Mar 13, 2020 | Jan 8, 2020 |
| Mfsa2020 01 | — | Upgrade to Mozilla Firefox version 72.0Upgrade to the latest version of Mozilla Firefox | Jan 8, 2020 | Jan 7, 2020 |
| Mfsa2020 02 | — | Upgrade to Mozilla Firefox ESR version 68.4Upgrade to the latest version of Mozilla Firefox | Jan 8, 2020 | Jan 7, 2020 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 68.4.1Upgrade to the latest version of Mozilla Thunderbird | Jan 13, 2020 | Jan 8, 2020 |
| Oracle Solaris | — | Upgrade mail/thunderbird to version 68.4.1-11.4.18.0.1.3.0 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 68.4.1-11.4.18.0.1.3.0 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 68.4.1-11.4.18.0.1.3.0 on Solaris 11.4Upgrade web/browser/firefox to version 68.4.1-11.4.18.0.1.3.0 on Solaris 11.4 | Jan 19, 2021 | Jan 8, 2020 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Jan 19, 2020 | Jan 7, 2020 |
| Redhat_linux | — | Upgrade firefoxUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceNo solution existsUpgrade firefox-debugsource | Jan 14, 2020 | Jan 8, 2020 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-develUpgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox | Jan 11, 2020 | Jan 8, 2020 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Jan 10, 2020 | Jan 8, 2020 |
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