Description
Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.31 |
| Mozilla | Thunderbird | — | 140.6 |
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 | 140.6.0esr-1 | — |
| Debian 14 | thunderbird | 1:140.6.0esr-1 | — |
| Debian 13 | firefox-esr | 140.6.0esr-1~deb13u1 | DSA-6078-1 |
| Debian 13 | thunderbird | 1:140.6.0esr-1~deb13u1 | DSA-6081-1 |
| Debian 12 | firefox-esr | 140.6.0esr-1~deb12u1 | DSA-6078-1 |
| Debian 12 | thunderbird | 1:140.6.0esr-1~deb12u1 | DSA-6081-1 |
| Debian 11 | firefox-esr | 140.6.0esr-1~deb11u1 | DLA-4401-1 |
| Debian 11 | thunderbird | 1:140.6.0esr-1~deb11u1 | DLA-4405-1 |
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 | 140.6.0-1.el10_1 | RHSA-2026:0025, RHSA-2025:23035 |
| RHEL 9 | firefox +2 | 140.6.0-1.el9_7 | RHSA-2025:23856, RHSA-2025:23034 |
| RHEL 8 | firefox +1 | 140.6.0-1.el8_10 | RHSA-2026:0026, RHSA-2025:23128 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.6.0-1.el10_0 | RHSA-2026:0127, RHSA-2026:0124 |
| RHEL 9.6 EUS | firefox +1 | 140.6.0-2.el9_6 | RHSA-2026:0013 |
| RHEL 9.6 EUS | thunderbird | 140.6.0-1.el9_6 | RHSA-2026:0003 |
| RHEL 9.4 EUS | firefox +2 | 140.6.0-1.el9_4 | RHSA-2026:0016, RHSA-2026:0004 |
| RHEL 9.2 E4S | firefox +2 | 140.6.0-1.el9_2 | RHSA-2026:0019, RHSA-2026:0017 |
| RHEL 9.0 E4S | firefox +1 | 140.6.0-1.el9_0 | RHSA-2026:0020, RHSA-2026:0018 |
| RHEL 8.8 TUS | firefox | 140.6.0-2.el8_8 | RHSA-2026:0015 |
| RHEL 8.8 TUS | thunderbird | 140.6.0-1.el8_8 | RHSA-2026:0021 |
| RHEL 8.8 E4S | firefox | 140.6.0-2.el8_8 | RHSA-2026:0015 |
| RHEL 8.8 E4S | thunderbird | 140.6.0-1.el8_8 | RHSA-2026:0021 |
| RHEL 8.6 TUS | firefox | 140.6.0-2.el8_6 | RHSA-2026:0014 |
| RHEL 8.6 TUS | thunderbird | 140.6.0-1.el8_6 | RHSA-2026:0022 |
| RHEL 8.6 E4S | firefox | 140.6.0-2.el8_6 | RHSA-2026:0014 |
| RHEL 8.6 E4S | thunderbird | 140.6.0-1.el8_6 | RHSA-2026:0022 |
| RHEL 8.6 AUS | firefox | 140.6.0-2.el8_6 | RHSA-2026:0014 |
| RHEL 8.6 AUS | thunderbird | 140.6.0-1.el8_6 | RHSA-2026:0022 |
| RHEL 8.4 EUS Long Life | firefox | 140.6.0-2.el8_4 | RHSA-2026:0006 |
| RHEL 8.4 EUS Long Life | thunderbird | 140.6.0-1.el8_4 | RHSA-2026:0023 |
| RHEL 8.4 AUS | firefox | 140.6.0-2.el8_4 | RHSA-2026:0006 |
| RHEL 8.4 AUS | thunderbird | 140.6.0-1.el8_4 | RHSA-2026:0023 |
| RHEL 8.2 AUS | firefox +1 | 140.6.0-1.el8_2 | RHSA-2026:0024, RHSA-2026:0005 |
| RHEL 7 ELS | firefox | 140.6.0-1.el7_9 | RHSA-2026:0007 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.6.0-1.el10_1 | ALSA-2025:23035 |
| AlmaLinux 10 | thunderbird | 140.6.0-1.el10_1.alma.1 | ALSA-2026:0025 |
| AlmaLinux 9 | firefox +2 | 140.6.0-1.el9_7.alma.1 | ALSA-2025:23856, ALSA-2025:23034 |
| AlmaLinux 8 | firefox +1 | 140.6.0-1.el8_10.alma.1 | ALSA-2026:0026, ALSA-2025:23128 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox +1 | 140.6.0-1.el10_1 | RLSA-2026:0025, RLSA-2025:23035 |
| Rocky Linux 9 | firefox +1 | 140.6.0-1.el9_7 | RLSA-2025:23856, RLSA-2025:23034 |
| Rocky Linux 8 | firefox +1 | 140.6.0-1.el8_10 | RLSA-2026:0026, RLSA-2025:23128 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLES 15 SP7 | MozillaThunderbird | 140.6.0-150200.8.248.1 | SUSE-SU-2025:4397-1 |
| SLES 15 SP6 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLES 15 SP6 | MozillaThunderbird | 140.6.0-150200.8.248.1 | SUSE-SU-2025:4397-1 |
| SLES 15 SP5 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLES 15 SP4 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLES 15 SP3 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 140.6.0-112.292.1 | SUSE-SU-2025:4396-1 |
| SLES for SAP 16.0 | MozillaFirefox | 140.6.0-160000.1.1 | SUSE-SU-2026:20031-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLES 16.0 | MozillaFirefox | 140.6.0-160000.1.1 | SUSE-SU-2026:20031-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 146.0-1.1 | openSUSE-SU-2025:15813-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.6.0-1.1 | openSUSE-SU-2025:15814-1, openSUSE-SU-2025:15809-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 140.6.0-160000.1.1 | openSUSE-SU-2026:20014-1 |
| openSUSE Leap 16.0 | MozillaThunderbird | 140.6.0-bp160.1.1 | openSUSE-SU-2026:20046-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 140.6.0-150200.152.213.1 | SUSE-SU-2025:4424-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 140.6.0-150200.8.248.1 | SUSE-SU-2025:4397-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.6.0-1.amzn2023.0.1 | ALAS2023-2025-1337 |
| Amazon Linux 2 | thunderbird | 140.6.0-1.amzn2.0.1 | ALAS2-2025-3108 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 140.6.0-1.0.1.el10_1 | ELSA-2026-0025, ELSA-2025-23035 |
| Oracle Linux 9 | firefox +2 | 140.6.0-1.0.1.el9_7 | ELSA-2025-23856, ELSA-2025-23034 |
| Oracle Linux 8 | firefox +1 | 140.6.0-1.0.1.el8_10 | ELSA-2026-0026, ELSA-2025-23128 |
| Oracle Linux 7 | firefox | 140.6.0-1.0.1.el7_9 | ELSA-2026-0007 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 140.6-r0 | — |
Advisories 50
- WID-SEC-2025-2812 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 5, 2026
- ALSA-2026:0025 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:23035 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:23856 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:23034 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:0026 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:23128 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-0489 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 21, 2026
- RHSA-2026:0127 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0124 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0025 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0026 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0023 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0024 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0022 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0020 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0021 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0018 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0019 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0016 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0017 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0015 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0014 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0007 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0013 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0006 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0004 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0005 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0003 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:23856 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:23128 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:23034 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:23035 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- openSUSE-SU-2026:20046-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:20014-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15809-1 firefox-esr-140.6.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15813-1 MozillaFirefox-146.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15814-1 MozillaThunderbird-140.6.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20031-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4396-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4424-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4397-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- ELSA-2026-0007 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 15, 2026
- ALAS2023-2025-1337 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jan 7, 2026
- ALAS2-2025-3108 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 5, 2026
- RLSA-2026:0026 Important: thunderbird security update Rocky Linux Security Advisories · Jan 5, 2026
- RLSA-2026:0025 Important: thunderbird security update Rocky Linux Security Advisories · Jan 5, 2026
- ELSA-2026-0026 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 5, 2026
- ELSA-2026-0025 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jan 5, 2026
- RLSA-2025:23856 Important: thunderbird security update Rocky Linux Security Advisories · Dec 23, 2025
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2000218
- https://www.mozilla.org/security/advisories/mfsa2025-92/
- https://www.mozilla.org/security/advisories/mfsa2025-93/
- https://www.mozilla.org/security/advisories/mfsa2025-94/
- https://www.mozilla.org/security/advisories/mfsa2025-95/
- https://www.mozilla.org/security/advisories/mfsa2025-96/