Description
By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 79 | 79 |
| Mozilla | Firefox ESR | unspecified – < 68.11, unspecified – < 78.1 | 68.11 |
| Mozilla | Thunderbird | unspecified – < 68.11, unspecified – < 78.1 | 68.11 |
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 | 68.11.0esr-1 | — |
| Debian 14 | thunderbird | 1:68.11.0-1 | — |
| Debian 13 | firefox-esr | 68.11.0esr-1 | — |
| Debian 13 | thunderbird | 1:68.11.0-1 | — |
| Debian 12 | firefox-esr | 68.11.0esr-1 | — |
| Debian 12 | thunderbird | 1:68.11.0-1 | — |
| Debian 10 | firefox-esr | 68.11.0esr-1~deb10u1 | DSA-4736-1 |
| Debian 10 | thunderbird | 1:68.11.0-1~deb10u1 | DSA-4740-1 |
| Debian 9 | firefox-esr | 68.11.0esr-1~deb9u1 | DLA-2297-1 |
| Debian 9 | thunderbird | 1:68.11.0-1~deb9u1 | DLA-2310-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | firefox | 79.0+build1-0ubuntu0.20.04.1 | USN-4443-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:78.7.1+build1-0ubuntu0.20.04.1 | — |
| Ubuntu 18.04 LTS | firefox | 79.0+build1-0ubuntu0.18.04.1 | USN-4443-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:78.8.1+build1-0ubuntu0.18.04.1 | — |
| Ubuntu 16.04 LTS | firefox | 79.0+build1-0ubuntu0.16.04.2 | USN-4443-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox +1 | 68.11.0-1.el8_2 | RHSA-2020:3341, RHSA-2020:3241 |
| RHEL 7 | firefox +1 | 68.11.0-1.el7_8 | RHSA-2020:3344, RHSA-2020:3253 |
| RHEL 6 | firefox +1 | 68.11.0-1.el6_10 | RHSA-2020:3345, RHSA-2020:3233 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.1 EUS | firefox +1 | 68.11.0-1.el8_1 | RHSA-2020:3342, RHSA-2020:3254 |
| RHEL 8.0 E4S | firefox +1 | 68.11.0-1.el8_0 | RHSA-2020:3343, RHSA-2020:3229 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | MozillaFirefox | 78.1.0-8.3.1 | SUSE-SU-2020:2147-1 |
| SLES 15 SP2 | MozillaFirefox-branding-SLE | 78-9.2.4 | SUSE-SU-2020:2147-1 |
| SLES 15 SP2 | MozillaThunderbird | 68.11.0-3.91.1 | SUSE-SU-2020:2179-1 |
| SLES 15 SP2 | pipewire | 0.3.6-3.3.2 | SUSE-SU-2020:2147-1 |
| SLES 15 SP1 | MozillaFirefox | 78.1.0-3.100.2 | SUSE-SU-2020:2118-1 |
| SLES 15 SP1 | MozillaThunderbird | 68.11.0-3.91.1 | SUSE-SU-2020:2179-1 |
| SLES 12 SP5 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SLES 12 SP4 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SLES 12 SP3 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SLES 11 SP4 | MozillaFirefox | 78.1.0-78.87.1 | SUSE-SU-2020:14456-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 78.1.0-112.8.1 | SUSE-SU-2020:2100-1 |
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 15.2 | MozillaFirefox | 78.1.0-lp152.2.12.1 | openSUSE-SU-2020:1189-1, openSUSE-SU-2020:1155-1 |
| openSUSE Leap 15.2 | MozillaThunderbird | 68.11.0-lp152.2.7.1 | openSUSE-SU-2020:1205-1 |
| openSUSE Leap 15.2 | pipewire | 0.3.6-lp152.2.3.1 | openSUSE-SU-2020:1189-1 |
| openSUSE Leap 15.1 | MozillaFirefox | 78.1.0-lp151.2.61.1 | openSUSE-SU-2020:1147-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.11.0-lp151.2.47.1 | openSUSE-SU-2020:1179-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 79.0-r0 | — |
| Alpine v3.23 | firefox +1 | 79.0-r0 | — |
| Alpine v3.23 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.22 | firefox +1 | 79.0-r0 | — |
| Alpine v3.22 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.21 | firefox +1 | 79.0-r0 | — |
| Alpine v3.21 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.20 | firefox | 79.0-r0 | — |
| Alpine v3.20 | firefox-esr | 78.1.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 79.0-r0 | — |
| Alpine v3.19 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.18 | firefox | 79.0-r0 | — |
| Alpine v3.18 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.17 | firefox | 79.0-r0 | — |
| Alpine v3.17 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.16 | firefox | 79.0-r0 | — |
| Alpine v3.16 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.15 | firefox | 79.0-r0 | — |
| Alpine v3.15 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.14 | firefox | 79.0-r0 | — |
| Alpine v3.14 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.13 | firefox | 79.0-r0 | — |
| Alpine v3.13 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.12 | firefox | 79.0-r0 | — |
| Alpine v3.12 | firefox-esr | 78.1.0-r0 | — |
| Alpine v3.12 | mozjs68 | 68.11.0-r0 | — |
| Alpine v3.11 | firefox-esr | 68.11.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 68.11.0-1.amzn2 | ALAS2-2020-1487 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox +1 | 68.11.0-1.0.1.el8_2 | ELSA-2020-3341, ELSA-2020-3241 |
| Oracle Linux 7 | firefox +1 | 68.11.0-1.0.1.el7_8 | ELSA-2020-3344, ELSA-2020-3253 |
Advisories 33
- RHSA-2020:3345 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3343 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3344 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3341 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3342 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3253 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3254 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3241 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3233 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:3229 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-4443-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4736-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4740-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2297-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2310-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:14456-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2179-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1179-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1147-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1155-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2147-1 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
- openSUSE-SU-2020:1205-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2118-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1189-1 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-2020:2100-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2020-1487 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 2, 2020
- ELSA-2020-3344 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 7, 2020
- ELSA-2020-3341 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 6, 2020
- ELSA-2020-3253 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 31, 2020
- ELSA-2020-3241 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2020
References
- https://www.mozilla.org/security/advisories/mfsa2020-30/
- https://www.mozilla.org/security/advisories/mfsa2020-35/
- https://www.mozilla.org/security/advisories/mfsa2020-32/
- https://www.mozilla.org/security/advisories/mfsa2020-33/
- https://www.mozilla.org/security/advisories/mfsa2020-31/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1634872
- openSUSE-SU-2020:1179 vendor-advisory
- openSUSE-SU-2020:1189 vendor-advisory
- openSUSE-SU-2020:1205 vendor-advisory
- USN-4443-1 vendor-advisory