Description
Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 128.12 |
| Mozilla | Thunderbird | — | 128.12 |
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 | 128.12.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.12.0esr-1 | — |
| Debian 13 | firefox-esr | 128.12.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.12.0esr-1 | — |
| Debian 12 | firefox-esr | 128.12.0esr-1~deb12u1 | DSA-5950-1 |
| Debian 12 | thunderbird | 1:128.12.0esr-1~deb12u1 | DSA-5959-1 |
| Debian 11 | firefox-esr | 128.12.0esr-1~deb11u1 | DLA-4231-1 |
| Debian 11 | thunderbird | 1:128.12.0esr-1~deb11u1 | DLA-4239-1 |
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 22.04 LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
| 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 | firefox +1 | 128.12.0-1.el10_0 | RHSA-2025:10195, RHSA-2025:10073 |
| RHEL 9 | firefox +2 | 128.12.0-1.el9_6 | RHSA-2025:10196, RHSA-2025:10072 |
| RHEL 8 | firefox +1 | 128.12.0-1.el8_10 | RHSA-2025:10246, RHSA-2025:10074 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 128.12.0-1.el9_4 | RHSA-2025:10188, RHSA-2025:10159 |
| RHEL 9.2 E4S | firefox +2 | 128.12.0-1.el9_2 | RHSA-2025:10185, RHSA-2025:10160 |
| RHEL 9.0 E4S | firefox +1 | 128.12.0-1.el9_0 | RHSA-2025:10187, RHSA-2025:10161 |
| RHEL 8.8 TUS | firefox +1 | 128.12.0-1.el8_8 | RHSA-2025:10186, RHSA-2025:10163 |
| RHEL 8.8 E4S | firefox +1 | 128.12.0-1.el8_8 | RHSA-2025:10186, RHSA-2025:10163 |
| RHEL 8.6 TUS | firefox +1 | 128.12.0-1.el8_6 | RHSA-2025:10183, RHSA-2025:10164 |
| RHEL 8.6 E4S | firefox +1 | 128.12.0-1.el8_6 | RHSA-2025:10183, RHSA-2025:10164 |
| RHEL 8.6 AUS | firefox +1 | 128.12.0-1.el8_6 | RHSA-2025:10183, RHSA-2025:10164 |
| RHEL 8.4 AUS | firefox +1 | 128.12.0-1.el8_4 | RHSA-2025:10184, RHSA-2025:10165 |
| RHEL 8.2 AUS | firefox +1 | 128.12.0-1.el8_2 | RHSA-2025:10182, RHSA-2025:10166 |
| RHEL 7 ELS | firefox | 128.12.0-1.el7_9 | RHSA-2025:10181 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 128.12.0-1.el10_0 | ALSA-2025:10073 |
| AlmaLinux 9 | firefox +1 | 128.12.0-1.el9_6.alma.1 | ALSA-2025:10072 |
| AlmaLinux 8 | firefox +1 | 128.12.0-1.el8_10.alma.1 | ALSA-2025:10246, ALSA-2025:10074 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox +1 | 128.12.0-1.el10_0 | RLSA-2025:10195, RLSA-2025:10073 |
| Rocky Linux 9 | firefox +1 | 128.12.0-1.el9_6 | RLSA-2025:10196, RLSA-2025:10072 |
| Rocky Linux 8 | firefox +1 | 128.12.0-1.el8_10 | RLSA-2025:10246, RLSA-2025:10074 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES 15 SP7 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP7 | MozillaThunderbird | 128.12.0-150200.8.227.2 | SUSE-SU-2025:02546-1, SUSE-SU-2025:02368-1 |
| SLES 15 SP7 | pipewire | 0.3.6-150200.3.11.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP6 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES 15 SP6 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.12.0-150200.8.227.2 | SUSE-SU-2025:02546-1, SUSE-SU-2025:02368-1 |
| SLES 15 SP6 | pipewire | 0.3.6-150200.3.11.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP5 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES 15 SP5 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP5 | pipewire | 0.3.64-150500.3.7.2 | SUSE-SU-2025:02529-1 |
| SLES 15 SP5 | xdg-desktop-portal | 1.16.0-150500.3.8.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP4 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES 15 SP4 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP4 | pipewire | 0.3.49-150400.3.7.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP4 | xdg-desktop-portal | 1.10.1-150400.3.8.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP3 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES 15 SP3 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP3 | pipewire | 0.3.24-150300.4.8.1 | SUSE-SU-2025:02529-1 |
| SLES 15 SP3 | xdg-desktop-portal | 1.8.0-150200.5.8.1 | SUSE-SU-2025:02529-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 128.12.0-112.265.1 | SUSE-SU-2025:02339-1, SUSE-SU-2025:02123-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 140-35.19.5 | SUSE-SU-2025:02339-1 |
| SLES for SAP 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES for SAP 15 SP5 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP5 | pipewire | 0.3.64-150500.3.7.2 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP5 | xdg-desktop-portal | 1.16.0-150500.3.8.1 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES for SAP 15 SP4 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP4 | pipewire | 0.3.49-150400.3.7.1 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP4 | xdg-desktop-portal | 1.10.1-150400.3.8.1 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLES for SAP 15 SP3 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP3 | pipewire | 0.3.24-150300.4.8.1 | SUSE-SU-2025:02529-1 |
| SLES for SAP 15 SP3 | xdg-desktop-portal | 1.8.0-150200.5.8.1 | SUSE-SU-2025:02529-1 |
| SLES 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLE HPC 15 SP5 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP5 | pipewire | 0.3.64-150500.3.7.2 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP5 | xdg-desktop-portal | 1.16.0-150500.3.8.1 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLE HPC 15 SP4 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP4 | pipewire | 0.3.49-150400.3.7.1 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP4 | xdg-desktop-portal | 1.10.1-150400.3.8.1 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SLE HPC 15 SP3 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP3 | pipewire | 0.3.24-150300.4.8.1 | SUSE-SU-2025:02529-1 |
| SLE HPC 15 SP3 | xdg-desktop-portal | 1.8.0-150200.5.8.1 | SUSE-SU-2025:02529-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| SUSE Enterprise Storage 7.1 | pipewire | 0.3.24-150300.4.8.1 | SUSE-SU-2025:02529-1 |
| SUSE Enterprise Storage 7.1 | xdg-desktop-portal | 1.8.0-150200.5.8.1 | SUSE-SU-2025:02529-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 140.0.2-1.1 | openSUSE-SU-2025:15325-1 |
| openSUSE Tumbleweed | mozjs128 +2 | 128.12.0-1.1 | openSUSE-SU-2025:15315-1, openSUSE-SU-2025:15312-1, openSUSE-SU-2025:15216-1 |
| openSUSE Leap 16.0 | mozjs128 | 128.14.0-160000.1.1 | openSUSE-SU-2025:20135-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.12.0-150200.152.188.1 | SUSE-SU-2025:02529-1, SUSE-SU-2025:02122-1 |
| openSUSE Leap 15.6 | MozillaFirefox-branding-SLE | 140-150200.9.21.1 | SUSE-SU-2025:02529-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.12.0-150200.8.227.2 | SUSE-SU-2025:02546-1, SUSE-SU-2025:02368-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 128.12.0-1.amzn2023.0.1 | ALAS2023-2025-1055 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox | 128.12.0-1.0.1.el10_0 | ELSA-2025-10073 |
| Oracle Linux 9 | firefox +1 | 128.12.0-1.0.1.el9_6 | ELSA-2025-10072 |
| Oracle Linux 8 | firefox | 128.12.0-1.0.1.el8_10 | ELSA-2025-10074 |
| Oracle Linux 7 | firefox | 128.12.0-1.0.1.el7_9 | ELSA-2025-10181 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.12-r0 | — |
Advisories 50
- ALSA-2025:10073 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:10072 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:10246 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:10074 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:10246 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10195 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10196 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10188 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10186 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10187 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10184 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10185 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10182 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10183 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10181 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10165 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10166 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10163 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10164 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10160 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10161 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10159 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10074 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10073 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:10072 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- WID-SEC-2025-1395 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 11, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:20135-1 Security update for mozjs128 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15325-1 MozillaFirefox-140.0.2-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15312-1 MozillaThunderbird-128.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15315-1 libmozjs-128-0-128.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15216-1 firefox-esr-128.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02122-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21170-1 Security update for mozjs128 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02339-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02529-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02368-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02123-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5950-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4239-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5959-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4231-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:02546-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- RLSA-2025:10196 Important: thunderbird security update Rocky Linux Security Advisories · Oct 7, 2025
- RLSA-2025:10072 Important: firefox security update Rocky Linux Security Advisories · Oct 4, 2025
- RLSA-2025:10073 Important: firefox security update Rocky Linux Security Advisories · Oct 3, 2025
- RLSA-2025:10195 Important: thunderbird security update Rocky Linux Security Advisories · Oct 3, 2025
- RLSA-2025:10246 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:10074 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025