Description
When a file download is specified via the `Content-Disposition` header, that directive would be ignored if the file was included via a `<embed>` or `<object>` tag, potentially making a website vulnerable to a cross-site scripting attack. 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