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.
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 firefoxUpgrade firefox-esrUpgrade librewolf | Jun 11, 2020 | Jan 8, 2020 |
| Amazon Linux Ami 2 | — | Upgrade thunderbird-debuginfoUpgrade thunderbird | 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 firefoxUpgrade thunderbird-debuginfoUpgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade firefox-debuginfo | Jan 14, 2020 | Jan 8, 2020 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Jan 13, 2020 | Jan 8, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade www-client/firefox-bin. | Mar 13, 2020 | Jan 8, 2020 |
| Mfsa2020 01 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 72.0 | 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 the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 68.4.1 | Jan 13, 2020 | Jan 8, 2020 |
| Oracle Solaris | — | Upgrade 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 mail/thunderbird 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 thunderbirdUpgrade firefox | Jan 19, 2020 | Jan 7, 2020 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceNo solution exists | Jan 14, 2020 | Jan 8, 2020 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-develUpgrade MozillaThunderbirdUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-common | Jan 11, 2020 | Jan 8, 2020 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Jan 10, 2020 | Jan 8, 2020 |
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