Description
When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made the browser unable to leave fullscreen mode. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | unspecified – < 91.5 | 91.5 |
| Mozilla | Firefox | unspecified – < 96 | 96 |
| Mozilla | Thunderbird | unspecified – < 91.5 | 91.5 |
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 | 91.5.0esr-1 | — |
| Debian 14 | thunderbird | 1:91.5.0-1 | — |
| Debian 13 | firefox-esr | 91.5.0esr-1 | — |
| Debian 13 | thunderbird | 1:91.5.0-1 | — |
| Debian 12 | firefox-esr | 91.5.0esr-1 | — |
| Debian 12 | thunderbird | 1:91.5.0-1 | — |
| Debian 11 | firefox-esr | 91.5.0esr-1~deb11u1 | DSA-5044-1 |
| Debian 11 | thunderbird | 1:91.5.0-2~deb11u1 | DSA-5045-1 |
| Debian 10 | firefox-esr | 91.5.0esr-1~deb10u1 | DSA-5044-1 |
| Debian 10 | thunderbird | 1:91.5.0-2~deb10u1 | DSA-5045-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | firefox-esr | 91.5.0esr-1~deb9u1 | DLA-2880-1 |
| Debian 9 | thunderbird | 1:91.5.0-1~deb9u1 | DLA-2881-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | firefox | 96.0+build2-0ubuntu1 | — |
| Ubuntu 22.04 LTS | mozjs78 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:91.5.0+build1-0ubuntu1 | — |
| Ubuntu 20.04 LTS | firefox | 96.0+build2-0ubuntu0.20.04.1 | USN-5229-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:91.5.0+build1-0ubuntu0.20.04.1 | USN-5248-1 |
| Ubuntu 18.04 LTS | firefox | 96.0+build2-0ubuntu0.18.04.1 | USN-5229-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:91.5.0+build1-0ubuntu0.18.04.1 | USN-5248-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox +1 | 91.5.0-1.el8_5 | RHSA-2022:0130, RHSA-2022:0129 |
| RHEL 7 | firefox +1 | 91.5.0-1.el7_9 | RHSA-2022:0127, RHSA-2022:0124 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.4 EUS | firefox +1 | 91.5.0-1.el8_4 | RHSA-2022:0128, RHSA-2022:0126 |
| RHEL 8.2 EUS | firefox +1 | 91.5.0-1.el8_2 | RHSA-2022:0132, RHSA-2022:0123 |
| RHEL 8.1 E4S | firefox +1 | 91.5.0-1.el8_1 | RHSA-2022:0131, RHSA-2022:0125 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | firefox +1 | 91.5.0-1.el8_5.alma | ALSA-2022:0130, ALSA-2022:0129 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | firefox +1 | 91.5.0-1.el8_5 | RLSA-2022:0130, RLSA-2022:0129 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLES 15 SP3 | MozillaThunderbird | 91.5.0-8.51.1 | SUSE-SU-2022:0199-1 |
| SLES 15 SP2 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLES 15 SP1 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES 15 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES 12 SP5 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES 12 SP3 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES 12 SP2 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES 11 SP4 | MozillaFirefox | 91.5.0-78.159.1 | SUSE-SU-2022:14880-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES for SAP 15 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SLE HPC 15 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE Manager Server 4.1 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE Manager Retail Branch Server 4.1 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE Manager Proxy 4.1 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 91.5.0-112.86.1 | SUSE-SU-2022:0115-1 |
| SUSE Enterprise Storage 7 | MozillaFirefox | 91.5.0-152.12.1 | SUSE-SU-2022:0136-1 |
| SUSE Enterprise Storage 6 | MozillaFirefox | 91.5.0-150.15.1 | SUSE-SU-2022:0137-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 96.0-1.1 | openSUSE-SU-2024:11732-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.5.0-1.1 | openSUSE-SU-2024:11733-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.3 | MozillaFirefox | 91.5.0-152.12.1 | openSUSE-SU-2022:0136-1 |
| openSUSE Leap 15.3 | MozillaThunderbird | 91.5.0-8.51.1 | openSUSE-SU-2022:0199-1 |
| openSUSE Leap 15.3 | civetweb | 1.15-lp153.2.3.1 | openSUSE-SU-2022:0136-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 97.0-r0 | — |
| Alpine v3.23 | firefox +1 | 97.0-r0 | — |
| Alpine v3.23 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.22 | firefox +1 | 97.0-r0 | — |
| Alpine v3.22 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.21 | firefox +1 | 97.0-r0 | — |
| Alpine v3.21 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.20 | firefox | 97.0-r0 | — |
| Alpine v3.20 | firefox-esr +1 | 91.5.0-r0 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 97.0-r0 | — |
| Alpine v3.19 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.18 | firefox | 97.0-r0 | — |
| Alpine v3.18 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.17 | firefox | 97.0-r0 | — |
| Alpine v3.17 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.16 | firefox | 97.0-r0 | — |
| Alpine v3.16 | firefox-esr +1 | 91.5.0-r0 | — |
| Alpine v3.15 | firefox-esr | 91.5.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 91.6.0-1.amzn2.0.1 | ALAS2-2022-1818 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox +1 | 91.5.0-1.0.1.el8_5 | ELSA-2022-0130, ELSA-2022-0129 |
| Oracle Linux 7 | firefox +1 | 91.5.0-1.0.2.el7_9 | ELSA-2022-0127, ELSA-2022-0124 |
Advisories 39
- RHSA-2022:0132 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- ALSA-2022:0130 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:0129 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0432 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2022-0302 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2022:0127 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2022:0124 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-5248-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-5229-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5044-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5045-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2880-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2881-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:0130 Important: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2022:0129 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:11732-1 MozillaFirefox-96.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0137-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0136-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0199-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0115-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0199-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0136-1 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-2022:14880-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11733-1 MozillaThunderbird-91.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2022:0131 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0130 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0128 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0129 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0126 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0125 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:0123 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- WID-SEC-2023-0839 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- WID-SEC-2022-0611 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 15, 2023
- ALAS2-2022-1818 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 21, 2022
- ELSA-2022-0129 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 13, 2022
- ELSA-2022-0130 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 13, 2022
- ELSA-2022-0124 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 12, 2022
- ELSA-2022-0127 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 12, 2022