# CVE-2019-17022: Firefox ESR: When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer does not… CVE-2019-17022 is fixed in 10 products on 2 platforms, first by firefox 72.0.1+build1-0ubuntu0.18.04.1, released January 8, 2020. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2019-17022 - Priority: Urgent - CVSS: 6.1 (Critical) - EPSS: 0.0199 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 8, 2020 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-17022 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox ESR (en-US) | 78.0esr | [Mozilla Firefox ESR (en-US) 78.0esr](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-78.0esr.md) | Jun 25, 2020 | | Linux | firefox RHEL 8 | 0:68.4.1-1.el8_1 | [RHSA-2020:0111](https://patchblox.com/security/data/fix/linux/rhsa-2020-0111.md) | Jan 14, 2020 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 72.0.1+build1-0ubuntu0.18.04.1 | [firefox 72.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-72.0.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 72.0.1+build1-0ubuntu1 | [firefox 72.0.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-72.0.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | firefox ol 8 | 0:68.4.1-1.0.1.el8_1 | [ELSA-2020-0111](https://patchblox.com/security/data/fix/linux/elsa-2020-0111.md) | Jan 15, 2020 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 72.0.1+build1-0ubuntu0.18.04.1 | [firefox-geckodriver 72.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-72.0.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 72.0.1+build1-0ubuntu1 | [firefox-geckodriver 72.0.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-72.0.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 72.0.1+build1-0ubuntu0.18.04.1 | [firefox-mozsymbols 72.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-72.0.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 72.0.1+build1-0ubuntu1 | [firefox-mozsymbols 72.0.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-72.0.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | thunderbird RHEL 8 | 0:68.4.1-2.el8_1 | [RHSA-2020:0127](https://patchblox.com/security/data/fix/linux/rhsa-2020-0127.md) | Jan 16, 2020 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:68.4.1+build1-0ubuntu0.18.04.1 | [thunderbird 1:68.4.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-68.4.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:68.4.1+build1-0ubuntu1 | [thunderbird 1:68.4.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-68.4.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | thunderbird ol 8 | 0:68.4.1-2.0.1.el8_1 | [ELSA-2020-0127](https://patchblox.com/security/data/fix/linux/elsa-2020-0127.md) | Jan 18, 2020 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:68.4.1+build1-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:68.4.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-68.4.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:68.4.1+build1-0ubuntu1 | [thunderbird-gnome-support 1:68.4.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-68.4.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:68.4.1+build1-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:68.4.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-68.4.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:68.4.1+build1-0ubuntu1 | [thunderbird-mozsymbols 1:68.4.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-68.4.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:68.4.1+build1-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:68.4.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-68.4.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:68.4.1+build1-0ubuntu1 | [xul-ext-calendar-timezones 1:68.4.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-68.4.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:68.4.1+build1-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:68.4.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-68.4.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:68.4.1+build1-0ubuntu1 | [xul-ext-gdata-provider 1:68.4.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-68.4.1-build1-0ubuntu1.md) | Jan 8, 2020 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:68.4.1+build1-0ubuntu0.18.04.1 | [xul-ext-lightning 1:68.4.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-68.4.1-build1-0ubuntu0.18.04.1.md) | Jan 8, 2020 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:68.4.1+build1-0ubuntu1 | [xul-ext-lightning 1:68.4.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-68.4.1-build1-0ubuntu1.md) | Jan 8, 2020 | --- Data as of 2026-11-07T18:46:35Z UTC. 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