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 librewolfUpgrade firefoxUpgrade firefox-esr | 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 thunderbirdUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade firefox-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debugsource | Jan 14, 2020 | Jan 8, 2020 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | 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 the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 68.4 | 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 thunderbirdUpgrade firefox-debuginfoNo solution existsUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade thunderbird-debuginfo | Jan 14, 2020 | Jan 8, 2020 |
| Suse | — | Upgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-devel | Jan 11, 2020 | Jan 8, 2020 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Jan 10, 2020 | Jan 8, 2020 |
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