Description
A background script invoking <code>requestFullscreen</code> and then blocking the main thread could force the browser into fullscreen mode indefinitely, resulting in potential user confusion or spoofing attacks. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 110 | 110 |
| Mozilla | Thunderbird | unspecified – < 102.8 | 102.8 |
| Mozilla | Firefox ESR | unspecified – < 102.8 | 102.8 |
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 | 102.8.0esr-1 | — |
| Debian 14 | thunderbird | 1:102.8.0-1 | — |
| Debian 13 | firefox-esr | 102.8.0esr-1 | — |
| Debian 13 | thunderbird | 1:102.8.0-1 | — |
| Debian 12 | firefox-esr | 102.8.0esr-1 | — |
| Debian 12 | thunderbird | 1:102.8.0-1 | — |
| Debian 11 | firefox-esr | 102.8.0esr-1~deb11u1 | DSA-5350-1 |
| Debian 11 | thunderbird | 1:102.8.0-1~deb11u1 | DSA-5355-1 |
| Debian 10 | firefox-esr | 102.8.0esr-1~deb10u1 | DLA-3319-1 |
| Debian 10 | thunderbird | 1:102.8.0-1~deb10u1 | DLA-3324-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | mozjs78 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:102.8.0+build2-0ubuntu0.22.04.1 | USN-5943-1 |
| Ubuntu 20.04 LTS | firefox | 110.0+build3-0ubuntu0.20.04.1 | USN-5880-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:102.8.0+build2-0ubuntu0.20.04.1 | USN-5943-1 |
| Ubuntu 18.04 LTS | firefox | 110.0+build3-0ubuntu0.18.04.1 | USN-5880-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:102.8.0+build2-0ubuntu0.18.04.1 | USN-5943-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +2 | 102.8.0-2.el9_1 | RHSA-2023:0824, RHSA-2023:0810 |
| RHEL 8 | firefox +1 | 102.8.0-2.el8_7 | RHSA-2023:0821, RHSA-2023:0808 |
| RHEL 7 | firefox +1 | 102.8.0-2.el7_9 | RHSA-2023:0817, RHSA-2023:0812 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | firefox +1 | 102.8.0-2.el9_0 | RHSA-2023:0823, RHSA-2023:0809 |
| RHEL 8.6 EUS | firefox +1 | 102.8.0-2.el8_6 | RHSA-2023:0822, RHSA-2023:0807 |
| RHEL 8.4 EUS | firefox +1 | 102.8.0-2.el8_4 | RHSA-2023:0820, RHSA-2023:0805 |
| RHEL 8.2 TUS | firefox +1 | 102.8.0-2.el8_2 | RHSA-2023:0819, RHSA-2023:0811 |
| RHEL 8.2 E4S | firefox +1 | 102.8.0-2.el8_2 | RHSA-2023:0819, RHSA-2023:0811 |
| RHEL 8.2 AUS | firefox +1 | 102.8.0-2.el8_2 | RHSA-2023:0819, RHSA-2023:0811 |
| RHEL 8.1 E4S | firefox +1 | 102.8.0-2.el8_1 | RHSA-2023:0818, RHSA-2023:0806 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +2 | 102.8.0-2.el9_1.alma | ALSA-2023:0824, ALSA-2023:0810 |
| AlmaLinux 8 | firefox +1 | 102.8.0-2.el8_7.alma | ALSA-2023:0821, ALSA-2023:0808 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox +1 | 102.8.0-2.el9_1 | RLSA-2023:0824, RLSA-2023:0810 |
| Rocky Linux 8 | firefox +1 | 102.8.0-2.el8_7 | RLSA-2023:0821, RLSA-2023:0808 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLES 15 SP4 | MozillaThunderbird | 102.8.0-150200.8.105.2 | SUSE-SU-2023:0599-1 |
| SLES 15 SP3 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLES 15 SP2 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLES 15 SP1 | MozillaFirefox | 102.8.0-150000.150.76.1 | SUSE-SU-2023:0469-1 |
| SLES 12 SP5 | MozillaFirefox | 102.8.0-112.150.1 | SUSE-SU-2023:0466-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | MozillaFirefox | 102.8.0-112.150.1 | SUSE-SU-2023:0466-1 |
| SLES 12 SP2 | MozillaFirefox | 102.8.0-112.150.1 | SUSE-SU-2023:0466-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 102.8.0-150000.150.76.1 | SUSE-SU-2023:0469-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 102.8.0-112.150.1 | SUSE-SU-2023:0466-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 102.8.0-112.150.1 | SUSE-SU-2023:0466-1 |
| SLE Real Time 15 SP3 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 102.8.0-150000.150.76.1 | SUSE-SU-2023:0469-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 102.8.0-112.150.1 | SUSE-SU-2023:0466-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 102.8.0-112.150.1 | SUSE-SU-2023:0466-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| SUSE Enterprise Storage 7 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 110.0.1-1.1 | openSUSE-SU-2024:12753-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 102.8.0-1.1 | openSUSE-SU-2024:12713-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 102.8.0-150200.152.78.1 | SUSE-SU-2023:0461-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 102.8.0-150200.8.105.2 | SUSE-SU-2023:0599-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 102.8.0-r0 | — |
| Alpine v3.22 | firefox-esr | 102.8.0-r0 | — |
| Alpine v3.21 | firefox-esr | 102.8.0-r0 | — |
| Alpine v3.20 | firefox-esr | 102.8.0-r0 | — |
| Alpine v3.19 | firefox-esr | 102.8.0-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 102.8.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 102.8.0-1.amzn2.0.1 | ALAS2-2023-1983 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +2 | 102.8.0-2.0.1.el9_1 | ELSA-2023-0824, ELSA-2023-0810 |
| Oracle Linux 8 | firefox +1 | 102.8.0-2.0.1.el8_7 | ELSA-2023-0821, ELSA-2023-0808 |
| Oracle Linux 7 | firefox +1 | 102.8.0-2.0.1.el7_9 | ELSA-2023-0817, ELSA-2023-0812 |
Advisories 47
- ALSA-2023:0824 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:0810 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:0808 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:0821 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:0817 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:0812 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-5943-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-5880-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5350-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5355-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3319-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3324-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:0810 Important: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:0824 Important: thunderbird security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:0808 Important: firefox security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2023:0821 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2023:0469-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0461-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12753-1 MozillaFirefox-110.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12713-1 MozillaThunderbird-102.8.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0466-1 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-2023:0599-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2023:0823 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0824 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0821 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0822 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0820 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0819 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0818 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0811 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0809 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0810 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0808 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0807 Red Hat Security Advisory: Mozilla Firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0806 Red Hat Security Advisory: Mozilla Firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:0805 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- WID-SEC-2023-1424 Xerox FreeFlow Print Server für Solaris: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- ALAS2-2023-1983 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 15, 2024
- WID-SEC-2023-0385 Mozilla Firefox: Mehrere Schwachstellen ermöglichen Codeausführung BSI CERT-Bund (WID) · Sep 27, 2023
- WID-SEC-2023-0407 Mozilla Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 29, 2023
- ELSA-2023-0812 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 21, 2023
- ELSA-2023-0817 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 21, 2023
- ELSA-2023-0824 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Feb 20, 2023
- ELSA-2023-0810 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Feb 20, 2023
- ELSA-2023-0808 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 20, 2023
- ELSA-2023-0821 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 20, 2023