Skip to content
Fencer Vulns
medium 6.1

CVE-2019-17022 json

When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer does not escape < and > characters.

published 2020-01-08 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-7496

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

When pasting a &lt;style&gt; tag from the clipboard into a rich text editor, the CSS sanitizer does not escape &lt; and &gt; 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.

Patch / fix

  • mozilla firefox 72.0
  • mozilla firefox_esr 68.4
  • firefox-esr Debian 14, Debian 13, Debian 12 68.4.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:68.4.1-1

debian advisories DEBIAN-CVE-2019-17022

  • firefox Ubuntu 16.04 LTS 72.0.1+build1-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 72.0.1+build1-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 72.0.1+build1-0ubuntu1
  • thunderbird Ubuntu 16.04 LTS 1:68.7.0+build1-0ubuntu0.16.04.2
  • thunderbird Ubuntu 18.04 LTS 1:68.4.1+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:68.4.1+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2019-17022

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 6 68.4.1-2.el6_10
  • thunderbird RHEL 7 68.4.1-2.el7_7
  • thunderbird RHEL 8 68.4.1-2.el8_1
  • firefox RHEL 8 68.4.1-1.el8_1
  • firefox RHEL 6 68.4.1-1.el6_10
  • firefox RHEL 7 68.4.1-1.el7_7
  • firefox RHEL 8.0 E4S 68.4.1-1.el8_0
  • thunderbird RHEL 8.0 E4S 68.4.1-2.el8_0

red hat advisories RHSA-2020:0295RHSA-2020:0292RHSA-2020:0123RHSA-2020:0120RHSA-2020:0127RHSA-2020:0111

  • MozillaThunderbird SLE Workstation Extension 15 SP1, SLE Workstation Extension 15 68.4.1-3.66.1
  • MozillaFirefox SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 68.4.1-3.66.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +17 more 68.4.1-109.101.1
  • MozillaFirefox SLES 11 SP4-LTSS 68.4.1-78.57.1

suse advisories SUSE-SU-2020:0142-1SUSE-SU-2020:0078-1SUSE-SU-2020:14268-1SUSE-SU-2020:0068-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird openSUSE Leap 15.1 68.4.1-lp151.2.22.2
  • MozillaFirefox openSUSE Leap 15.1 68.4.1-lp151.2.24.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2020:0094-1openSUSE-SU-2020:0060-1

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 71.0.1-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 71.0.1-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +10 more 68.4.1-r0

alpine advisories ALPINE-CVE-2019-17022

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox Arch Linux 72.0-1
  • thunderbird Arch Linux 68.4.1-1

arch linux advisories AVG-1084AVG-1086

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-17022 updated cvss 6.1

Mozilla: CSS sanitization does not escape HTML tags

  • Red Hat Enterprise Linux 5 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 68.4.1-1.el8_1, thunderbird 68.4.1-2.el8_1
    fixed: vendor fix RHSA-2020:0111
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox 68.4.1-1.el8_0, thunderbird 68.4.1-2.el8_0
    fixed: vendor fix RHSA-2020:0295
  • Red Hat Enterprise Linux Client (v. 7) firefox 68.4.1-1.el7_7, thunderbird 68.4.1-2.el7_7 Red Hat Enterprise Linux Client Optional (v. 7) firefox 68.4.1-1.el7_7
    fixed: vendor fix RHSA-2020:0085
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 68.4.1-1.el6_10, thunderbird 68.4.1-2.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 68.4.1-1.el6_10 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 68.4.1-1.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 68.4.1-1.el6_10
    fixed: vendor fix RHSA-2020:0086
  • Red Hat Enterprise Linux Server (v. 7) firefox 68.4.1-1.el7_7
    fixed: vendor fix RHSA-2020:0085
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 68.4.1-1.el6_10, thunderbird 68.4.1-2.el6_10
    fixed: vendor fix RHSA-2020:0086
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 68.4.1-1.el7_7, thunderbird 68.4.1-2.el7_7
    fixed: vendor fix RHSA-2020:0085
show 4 more
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 68.4.1-1.el6_10, thunderbird 68.4.1-2.el6_10
    fixed: vendor fix RHSA-2020:0086
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 68.4.1-1.el7_7, thunderbird 68.4.1-2.el7_7
    fixed: vendor fix RHSA-2020:0085
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 68.4.1-1.el6_10
    fixed: vendor fix RHSA-2020:0086
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 68.4.1-1.el7_7
    fixed: vendor fix RHSA-2020:0085

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.99% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.