Description
Same-origin policy bypass in the Layout component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 140.3 |
| Mozilla | Thunderbird | — | 140.3 |
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 | 140.3.0esr-1 | — |
| Debian 14 | thunderbird | 1:140.3.0esr-1 | — |
| Debian 13 | firefox-esr | 140.3.0esr-1~deb13u1 | DSA-6003-1 |
| Debian 13 | thunderbird | 1:140.3.0esr-1~deb13u1 | DSA-6011-1 |
| Debian 12 | firefox-esr | 140.3.0esr-1~deb12u1 | DSA-6003-1 |
| Debian 12 | thunderbird | 1:140.3.0esr-1~deb12u1 | DSA-6011-1 |
| Debian 11 | firefox-esr | 140.3.0esr-1~deb11u2 | DLA-4305-1 |
| Debian 11 | thunderbird | 1:140.3.0esr-1~deb11u1 | DLA-4311-1 |
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 | 1:140.7.1+build1-0ubuntu0.22.04.1 | — |
| 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 | 140.3.0-1.el10_0 | RHSA-2025:16157, RHSA-2025:16109 |
| RHEL 9 | firefox +2 | 140.3.0-1.el9_6 | RHSA-2025:16156, RHSA-2025:16108 |
| RHEL 8 | firefox +1 | 140.3.0-1.el8_10 | RHSA-2025:16589, RHSA-2025:16260 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 140.3.0-1.el9_4 | RHSA-2025:17378, RHSA-2025:17346 |
| RHEL 9.2 E4S | firefox +2 | 140.3.0-1.el9_2 | RHSA-2025:17374, RHSA-2025:17345 |
| RHEL 9.0 E4S | firefox +1 | 140.3.0-1.el9_0 | RHSA-2025:17373, RHSA-2025:17344 |
| RHEL 8.8 TUS | firefox +1 | 140.3.0-1.el8_8 | RHSA-2025:17368, RHSA-2025:17343 |
| RHEL 8.8 E4S | firefox +1 | 140.3.0-1.el8_8 | RHSA-2025:17368, RHSA-2025:17343 |
| RHEL 8.6 TUS | firefox +1 | 140.3.0-1.el8_6 | RHSA-2025:17367, RHSA-2025:17342 |
| RHEL 8.6 E4S | firefox +1 | 140.3.0-1.el8_6 | RHSA-2025:17367, RHSA-2025:17342 |
| RHEL 8.6 AUS | firefox +1 | 140.3.0-1.el8_6 | RHSA-2025:17367, RHSA-2025:17342 |
| RHEL 8.4 EUS Long Life | firefox +1 | 140.3.0-1.el8_4 | RHSA-2025:17371, RHSA-2025:17341 |
| RHEL 8.4 AUS | firefox +1 | 140.3.0-1.el8_4 | RHSA-2025:17371, RHSA-2025:17341 |
| RHEL 8.2 AUS | firefox +1 | 140.3.0-1.el8_2 | RHSA-2025:17372, RHSA-2025:17340 |
| RHEL 7 ELS | firefox | 140.3.0-1.el7_9 | RHSA-2025:17453 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.3.0-1.el10_0 | ALSA-2025:16109 |
| AlmaLinux 10 | thunderbird | 140.3.0-1.el10_0.alma.1 | ALSA-2025:16157 |
| AlmaLinux 9 | firefox +2 | 140.3.0-1.el9_6.alma.1 | ALSA-2025:16156, ALSA-2025:16108 |
| AlmaLinux 8 | firefox +1 | 140.3.0-1.el8_10.alma.1 | ALSA-2025:16589, ALSA-2025:16260 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox +1 | 140.3.0-1.el10_0 | RLSA-2025:16157, RLSA-2025:16109 |
| Rocky Linux 9 | firefox +1 | 140.3.0-1.el9_6 | RLSA-2025:16156, RLSA-2025:16108 |
| Rocky Linux 8 | firefox +1 | 140.3.0-1.el8_10 | RLSA-2025:16589, RLSA-2025:16260 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLES 15 SP7 | MozillaThunderbird | 140.3.0-150200.8.239.1 | SUSE-SU-2025:03309-1 |
| SLES 15 SP6 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLES 15 SP6 | MozillaThunderbird | 140.3.0-150200.8.239.1 | SUSE-SU-2025:03309-1 |
| SLES 15 SP5 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLES 15 SP4 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLES 15 SP3 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 140.3.0-112.279.1 | SUSE-SU-2025:03287-1 |
| SLES for SAP 16.0 | MozillaFirefox | 140.5.0-160000.1.1 | SUSE-SU-2025:21021-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLES 16.0 | MozillaFirefox | 140.5.0-160000.1.1 | SUSE-SU-2025:21021-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 143.0-1.1 | openSUSE-SU-2025:15565-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.3.0-1.1 | openSUSE-SU-2025:15560-1, openSUSE-SU-2025:15555-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 140.5.0-160000.1.1 | openSUSE-SU-2025:20065-1 |
| openSUSE Leap 16.0 | MozillaThunderbird | 140.3.0-bp160.1.1 | openSUSE-SU-2025:20021-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 140.3.0-150200.152.201.1 | SUSE-SU-2025:03291-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 140.3.0-150200.8.239.1 | SUSE-SU-2025:03309-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.3.0-1.amzn2023.0.1 | ALAS2023-2025-1203 |
| Amazon Linux 2 | thunderbird | 140.3.0-1.amzn2.0.1 | ALAS2-2025-3008 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 140.3.0-1.0.1.el10_0 | ELSA-2025-16157, ELSA-2025-16109 |
| Oracle Linux 9 | firefox +2 | 140.3.0-1.0.1.el9_6 | ELSA-2025-16156, ELSA-2025-16108 |
| Oracle Linux 8 | firefox +1 | 140.3.0-1.0.1.el8_10 | ELSA-2025-16589, ELSA-2025-16260 |
| Oracle Linux 7 | firefox | 140.3.0-1.0.1.el7_9 | ELSA-2025-17453 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 140.3-r0 | — |
Advisories 50
- SUSE-SU-2025:03287-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Nov 10, 2026
- ALSA-2025:16109 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:16157 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:16108 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:16156 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:16589 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:16260 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:17453 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17378 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17373 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17374 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17371 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17372 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17367 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17368 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17346 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17345 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17343 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17344 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17342 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17340 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:17341 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:16589 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:16260 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:16109 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:16156 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:16157 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:16108 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2025-2074 Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 15, 2026
- openSUSE-SU-2025:20065-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:20021-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15560-1 MozillaThunderbird-140.3.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15565-1 MozillaFirefox-143.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15555-1 firefox-esr-140.3.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03291-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03309-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21021-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-6003-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4305-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ELSA-2025-17453 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 15, 2025
- RLSA-2025:16156 Important: thunderbird security update Rocky Linux Security Advisories · Oct 10, 2025
- RLSA-2025:16108 Important: firefox security update Rocky Linux Security Advisories · Oct 10, 2025
- RLSA-2025:16260 Important: firefox security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:16589 Important: thunderbird security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:16109 Important: firefox security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:16157 Important: thunderbird security update Rocky Linux Security Advisories · Oct 3, 2025
- ALAS2-2025-3008 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 29, 2025
- ALAS2023-2025-1203 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 29, 2025
- DLA-4311-1 thunderbird - security update Debian Security (DSA / DLA) · Sep 26, 2025
- DSA-6011-1 thunderbird - security update Debian Security (DSA / DLA) · Sep 25, 2025