Description
An attacker could cause a select dropdown to be shown over another tab; this could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 133 | 133 |
| Mozilla | Firefox ESR | unspecified – < 128.5 | 128.5 |
| Mozilla | Thunderbird | unspecified – < 133, unspecified – < 128.5 | 133 |
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 | 128.5.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.5.0esr-1 | — |
| Debian 13 | firefox-esr | 128.5.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.5.0esr-1 | — |
| Debian 12 | firefox-esr | 128.5.0esr-1~deb12u1 | DSA-5820-1 |
| Debian 12 | thunderbird | 1:128.5.0esr-1~deb12u1 | DSA-5821-1 |
| Debian 11 | firefox-esr | 128.5.0esr-1~deb11u1 | DLA-3971-1 |
| Debian 11 | thunderbird | 1:128.5.0esr-1~deb11u1 | DLA-3969-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 20.04 LTS | firefox | 133.0+build2-0ubuntu0.20.04.1 | USN-7134-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | qemu-img +19 | 18:10.1.0-16.el10_2 | RHSA-2026:18479 |
| RHEL 9 | firefox +1 | 128.5.1-1.el9_5 | RHSA-2024:10702 |
| RHEL 9 | thunderbird | 128.5.0-1.el9_5 | RHSA-2024:10592 |
| RHEL 8 | firefox | 128.5.1-1.el8_10 | RHSA-2024:10752 |
| RHEL 8 | thunderbird | 128.5.0-1.el8_10 | RHSA-2024:10591 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +1 | 128.5.1-1.el9_4 | RHSA-2024:10742 |
| RHEL 9.4 EUS | thunderbird | 128.5.0-1.el9_4 | RHSA-2024:10748 |
| RHEL 9.2 EUS | firefox +1 | 128.5.1-1.el9_2 | RHSA-2024:10745 |
| RHEL 9.2 EUS | thunderbird | 128.5.0-1.el9_2 | RHSA-2024:10667 |
| RHEL 9.0 E4S | firefox | 128.5.1-1.el9_0 | RHSA-2024:10743 |
| RHEL 9.0 E4S | thunderbird | 128.5.0-1.el9_0 | RHSA-2024:10703 |
| RHEL 8.8 EUS | firefox | 128.5.1-1.el8_8 | RHSA-2024:10848 |
| RHEL 8.8 EUS | thunderbird | 128.5.0-1.el8_8 | RHSA-2024:10710 |
| RHEL 8.6 TUS | firefox | 128.5.1-1.el8_6 | RHSA-2024:10880 |
| RHEL 8.6 TUS | thunderbird | 128.5.0-1.el8_6 | RHSA-2024:10734 |
| RHEL 8.6 E4S | firefox | 128.5.1-1.el8_6 | RHSA-2024:10880 |
| RHEL 8.6 E4S | thunderbird | 128.5.0-1.el8_6 | RHSA-2024:10734 |
| RHEL 8.6 AUS | firefox | 128.5.1-1.el8_6 | RHSA-2024:10880 |
| RHEL 8.6 AUS | thunderbird | 128.5.0-1.el8_6 | RHSA-2024:10734 |
| RHEL 8.4 TUS | firefox | 128.5.1-1.el8_4 | RHSA-2024:10849 |
| RHEL 8.4 TUS | thunderbird | 128.5.0-1.el8_4 | RHSA-2024:10733 |
| RHEL 8.4 E4S | firefox | 128.5.1-1.el8_4 | RHSA-2024:10849 |
| RHEL 8.4 E4S | thunderbird | 128.5.0-1.el8_4 | RHSA-2024:10733 |
| RHEL 8.4 AUS | firefox | 128.5.1-1.el8_4 | RHSA-2024:10849 |
| RHEL 8.4 AUS | thunderbird | 128.5.0-1.el8_4 | RHSA-2024:10733 |
| RHEL 8.2 AUS | firefox | 128.5.1-1.el8_2 | RHSA-2024:10844 |
| RHEL 8.2 AUS | thunderbird | 128.5.0-1.el8_2 | RHSA-2024:10704 |
| RHEL 7 ELS | firefox | 128.5.1-1.el7_9 | RHSA-2024:10881 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | qemu-img +19 | 18:10.1.0-16.el10_2.alma.1 | ALSA-2026:18479 |
| AlmaLinux 9 | firefox +1 | 128.5.1-1.el9_5 | ALSA-2024:10702 |
| AlmaLinux 9 | thunderbird | 128.5.0-1.el9_5.alma.1 | ALSA-2024:10592 |
| AlmaLinux 8 | firefox | 128.5.1-1.el8_10 | ALSA-2024:10752 |
| AlmaLinux 8 | thunderbird | 128.5.0-1.el8_10.alma.1 | ALSA-2024:10591 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | qemu-kvm | 8:10.1.0-16.el10_2 | RLSA-2026:18479 |
| Rocky Linux 8 | firefox | 128.5.1-1.el8_10 | RLSA-2024:10752 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
| SLES 15 SP5 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP5 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
| SLES 15 SP4 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP3 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP2 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 128.5.0-112.237.2 | SUSE-SU-2024:4074-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 133.0.3-1.1 | openSUSE-SU-2024:14583-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 128.5.0-1.1 | openSUSE-SU-2024:14533-1 |
| openSUSE Tumbleweed | mozjs128 +1 | 128.5.1-1.1 | openSUSE-SU-2024:14572-1, openSUSE-SU-2024:14542-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | thunderbird | 128.5.0-r0 | — |
| Alpine v3.22 | thunderbird | 128.5.0-r0 | — |
| Alpine v3.21 | thunderbird | 128.5.0-r0 | — |
| Alpine v3.20 | thunderbird | 128.5.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | qemu-img +18 | 18:10.1.0-16.el10_2 | ELSA-2026-18479 |
| Oracle Linux 9 | firefox +1 | 128.5.1-1.0.1.el9_5 | ELSA-2024-10702 |
| Oracle Linux 9 | thunderbird | 128.5.0-1.0.1.el9_5 | ELSA-2024-10592 |
| Oracle Linux 8 | firefox | 128.5.1-1.0.1.el8_10 | ELSA-2024-10752 |
| Oracle Linux 8 | thunderbird | 128.5.0-1.0.1.el8_10 | ELSA-2024-10591 |
| Oracle Linux 7 | firefox | 128.5.1-1.0.1.el7_9 | ELSA-2024-10881 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 133.0-r0 | — |
Advisories 46
- ALSA-2024:10592 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:10702 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:18479 Important: qemu-kvm security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:10591 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:10752 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:18479 Red Hat Security Advisory: qemu-kvm security update Red Hat Security Advisories (RHSA) · Jul 12, 2026
- ELSA-2026-18479 Important: qemu-kvm security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 8, 2026
- WID-SEC-2024-3549 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 31, 2026
- RLSA-2026:18479 Important: qemu-kvm security update Rocky Linux Security Advisories · May 29, 2026
- RHSA-2024:10881 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10849 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10880 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10848 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10752 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10844 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10748 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10743 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10745 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10734 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10742 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10733 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10704 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10710 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10703 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10667 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10702 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10591 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10592 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- USN-7134-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5820-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5821-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3969-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3971-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:10752 Important: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2024:4074-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4148-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14583-1 MozillaFirefox-133.0.3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4086-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14542-1 libmozjs-128-0-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14533-1 MozillaThunderbird-128.5.0-1.1 on GA media 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
- ELSA-2024-10881 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 16, 2024
- ELSA-2024-10702 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024
- ELSA-2024-10592 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024
- ELSA-2024-10752 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024
- ELSA-2024-10591 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024