Description
When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in data exfiltration. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | before 68.4 | — |
| Mozilla | Firefox | before 72 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 68.4.0esr-1 | — |
| Debian 14 | thunderbird | 1:68.4.1-1 | — |
| Debian 13 | firefox-esr | 68.4.0esr-1 | — |
| Debian 13 | thunderbird | 1:68.4.1-1 | — |
| Debian 12 | firefox-esr | 68.4.0esr-1 | — |
| Debian 12 | thunderbird | 1:68.4.1-1 | — |
| Debian 10 | firefox-esr | 68.4.1esr-1~deb10u1 | DSA-4600-1 |
| Debian 10 | thunderbird | 1:68.4.1-1~deb10u1 | DSA-4603-1 |
| Debian 9 | firefox-esr | 68.4.1esr-1~deb9u1 | DSA-4600-1 |
| Debian 9 | thunderbird | 1:68.4.1-1~deb9u1 | DSA-4603-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | firefox-esr | 68.4.0esr-1~deb8u1 | DLA-2061-1 |
| Debian 8 | thunderbird | 1:68.4.1-1~deb8u1 | DLA-2071-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | firefox | 72.0.1+build1-0ubuntu1 | — |
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:68.4.1+build1-0ubuntu1 | — |
| Ubuntu 18.04 LTS | firefox | 72.0.1+build1-0ubuntu0.18.04.1 | USN-4234-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:68.4.1+build1-0ubuntu0.18.04.1 | USN-4241-1 |
| Ubuntu 16.04 LTS | firefox | 72.0.1+build1-0ubuntu0.16.04.1 | USN-4234-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:68.7.0+build1-0ubuntu0.16.04.2 | USN-4335-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox | 68.4.1-1.el8_1 | RHSA-2020:0111 |
| RHEL 8 | thunderbird | 68.4.1-2.el8_1 | RHSA-2020:0127 |
| RHEL 7 | firefox | 68.4.1-1.el7_7 | RHSA-2020:0085 |
| RHEL 7 | thunderbird | 68.4.1-2.el7_7 | RHSA-2020:0120 |
| RHEL 6 | firefox | 68.4.1-1.el6_10 | RHSA-2020:0086 |
| RHEL 6 | thunderbird | 68.4.1-2.el6_10 | RHSA-2020:0123 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.0 E4S | firefox | 68.4.1-1.el8_0 | RHSA-2020:0295 |
| RHEL 8.0 E4S | thunderbird | 68.4.1-2.el8_0 | RHSA-2020:0292 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox +1 | 68.4.1-3.66.1 | SUSE-SU-2020:0142-1, SUSE-SU-2020:0078-1 |
| SLES 15 | MozillaFirefox +1 | 68.4.1-3.66.1 | SUSE-SU-2020:0142-1, SUSE-SU-2020:0078-1 |
| SLES 12 SP5 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES 12 SP4 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES 12 SP3 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES 12 SP1 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES 11 SP4 | MozillaFirefox | 68.4.1-78.57.1 | SUSE-SU-2020:14268-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.4.1-109.101.1 | SUSE-SU-2020:0068-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.1 | MozillaFirefox | 68.4.1-lp151.2.24.1 | openSUSE-SU-2020:0060-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.4.1-lp151.2.22.2 | openSUSE-SU-2020:0094-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 71.0.1-r0 | — |
| Alpine v3.23 | firefox +1 | 71.0.1-r0 | — |
| Alpine v3.23 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.22 | firefox +1 | 71.0.1-r0 | — |
| Alpine v3.22 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.21 | firefox +1 | 71.0.1-r0 | — |
| Alpine v3.21 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.20 | firefox | 71.0.1-r0 | — |
| Alpine v3.20 | firefox-esr | 68.4.1-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 71.0.1-r0 | — |
| Alpine v3.19 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.18 | firefox | 71.0.1-r0 | — |
| Alpine v3.18 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.17 | firefox | 71.0.1-r0 | — |
| Alpine v3.17 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.16 | firefox | 71.0.1-r0 | — |
| Alpine v3.16 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.15 | firefox | 71.0.1-r0 | — |
| Alpine v3.15 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.14 | firefox | 71.0.1-r0 | — |
| Alpine v3.14 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.13 | firefox | 71.0.1-r0 | — |
| Alpine v3.13 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.12 | firefox | 71.0.1-r0 | — |
| Alpine v3.12 | firefox-esr | 68.4.1-r0 | — |
| Alpine v3.11 | firefox-esr | 68.4.1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 68.4.1-2.amzn2.0.1 | ALAS2-2020-1393 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 68.4.1-1.0.1.el8_1 | ELSA-2020-0111 |
| Oracle Linux 8 | thunderbird | 68.4.1-2.0.1.el8_1 | ELSA-2020-0127 |
| Oracle Linux 7 | firefox | 68.4.1-1.0.1.el7_7 | ELSA-2020-0085 |
| Oracle Linux 7 | thunderbird | 68.4.1-2.0.1.el7_7 | ELSA-2020-0120 |
Advisories 29
- RHSA-2020:0123 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:0120 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:0085 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:0086 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4335-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4241-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4234-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4603-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4600-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2061-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2071-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2020:0094-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0078-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0060-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0068-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0142-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14268-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2020:0295 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:0292 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:0127 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:0111 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2020-1393 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 13, 2020
- ELSA-2020-0127 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 18, 2020
- ELSA-2020-0120 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 16, 2020
- ELSA-2020-0111 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 15, 2020
- ELSA-2020-0085 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 13, 2020
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1599181
- https://www.mozilla.org/security/advisories/mfsa2020-01/
- https://www.mozilla.org/security/advisories/mfsa2020-02/
- 20200109 [SECURITY] [DSA 4600-1] firefox-esr security update mailing-list
- [debian-lts-announce] 20200109 [SECURITY] [DLA 2061-1] firefox-esr security update mailing-list
- DSA-4600 vendor-advisory
- USN-4234-1 vendor-advisory
- 20200112 [slackware-security] mozilla-thunderbird (SSA:2020-010-01) mailing-list
- RHSA-2020:0085 vendor-advisory
- RHSA-2020:0086 vendor-advisory
- http://packetstormsecurity.com/files/155912/Slackware-Security-Advisory-mozilla-thunderbird-Updates.html
- RHSA-2020:0111 vendor-advisory
- openSUSE-SU-2020:0060 vendor-advisory
- RHSA-2020:0120 vendor-advisory
- RHSA-2020:0123 vendor-advisory
- RHSA-2020:0127 vendor-advisory
- USN-4241-1 vendor-advisory
- DSA-4603 vendor-advisory
- 20200120 [SECURITY] [DSA 4603-1] thunderbird security update mailing-list
- [debian-lts-announce] 20200120 [SECURITY] [DLA 2071-1] thunderbird security update mailing-list
- openSUSE-SU-2020:0094 vendor-advisory
- RHSA-2020:0292 vendor-advisory
- RHSA-2020:0295 vendor-advisory
- GLSA-202003-02 vendor-advisory
- USN-4335-1 vendor-advisory