Description
A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability was fixed in Firefox 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 128.9 |
| Mozilla | Thunderbird | — | 128.9 |
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 | 128.9.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.9.0esr-1 | — |
| Debian 13 | firefox-esr | 128.9.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.9.0esr-1 | — |
| Debian 12 | firefox-esr | 128.9.0esr-1~deb12u1 | DSA-5889-1 |
| Debian 12 | thunderbird | 1:128.9.0esr-1~deb12u1 | DSA-5891-1 |
| Debian 11 | firefox-esr | 128.9.0esr-1~deb11u1 | DLA-4109-1 |
| Debian 11 | thunderbird | 1:128.9.0esr-1~deb11u1 | DLA-4110-1 |
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 | 128.9.0-3.el10_0 | RHSA-2025:7491 |
| RHEL 10 | thunderbird | 128.9.0-2.el10_0 | RHSA-2025:7493 |
| RHEL 9 | firefox +2 | 128.9.0-2.el9_5 | RHSA-2025:4169, RHSA-2025:3556 |
| RHEL 8 | firefox +1 | 128.9.0-2.el8_10 | RHSA-2025:4170, RHSA-2025:3582 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 128.9.0-2.el9_4 | RHSA-2025:4026, RHSA-2025:3590 |
| RHEL 9.2 EUS | firefox +2 | 128.9.0-2.el9_2 | RHSA-2025:4027, RHSA-2025:3589 |
| RHEL 9.0 E4S | firefox +1 | 128.9.0-2.el9_0 | RHSA-2025:4028, RHSA-2025:3587 |
| RHEL 8.8 EUS | firefox +1 | 128.9.0-2.el8_8 | RHSA-2025:4029, RHSA-2025:3620 |
| RHEL 8.6 TUS | firefox +1 | 128.9.0-2.el8_6 | RHSA-2025:4030, RHSA-2025:3621 |
| RHEL 8.6 E4S | firefox +1 | 128.9.0-2.el8_6 | RHSA-2025:4030, RHSA-2025:3621 |
| RHEL 8.6 AUS | firefox +1 | 128.9.0-2.el8_6 | RHSA-2025:4030, RHSA-2025:3621 |
| RHEL 8.4 TUS | firefox +1 | 128.9.0-2.el8_4 | RHSA-2025:4031, RHSA-2025:3581 |
| RHEL 8.4 E4S | firefox +1 | 128.9.0-2.el8_4 | RHSA-2025:4031, RHSA-2025:3581 |
| RHEL 8.4 AUS | firefox +1 | 128.9.0-2.el8_4 | RHSA-2025:4031, RHSA-2025:3581 |
| RHEL 8.2 AUS | firefox +1 | 128.9.0-2.el8_2 | RHSA-2025:4032, RHSA-2025:3623 |
| RHEL 7 ELS | firefox | 128.9.0-2.el7_9 | RHSA-2025:3628 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 128.9.0-2.el9_5 | ALSA-2025:3556 |
| AlmaLinux 9 | thunderbird | 128.9.0-2.el9_5.alma.1 | ALSA-2025:4169 |
| AlmaLinux 8 | firefox | 128.9.0-2.el8_10 | ALSA-2025:3582 |
| AlmaLinux 8 | thunderbird | 128.9.0-2.el8_10.alma.1 | ALSA-2025:4170 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | firefox +1 | 128.9.0-2.el8_10 | RLSA-2025:4170, RLSA-2025:3582 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.9.0-150200.8.206.1 | SUSE-SU-2025:1157-1 |
| SLES 15 SP5 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLES 15 SP4 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLES 15 SP3 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLES 12 SP5 | MozillaFirefox | 128.9.0-112.252.1 | SUSE-SU-2025:1103-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 137.0-1.1 | openSUSE-SU-2025:14971-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 128.9.0-1.1 | openSUSE-SU-2025:14966-1, openSUSE-SU-2025:14961-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.9.0-150200.152.176.1 | SUSE-SU-2025:1138-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.9.0-150200.8.206.1 | SUSE-SU-2025:1157-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 128.9.0-1.amzn2023.0.1 | ALAS2023-2025-943 |
| Amazon Linux 2 | thunderbird | 128.9.1-1.amzn2.0.1 | ALAS2-2025-2840 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 128.11.0-1.0.1.el10_0 | ELSA-2025-7493, ELSA-2025-7491 |
| Oracle Linux 9 | firefox +2 | 128.9.0-2.0.1.el9_5 | ELSA-2025-4169, ELSA-2025-3556 |
| Oracle Linux 8 | firefox +1 | 128.9.0-2.0.1.el8_10 | ELSA-2025-4170, ELSA-2025-3582 |
| Oracle Linux 7 | firefox | 128.9.0-2.0.1.el7_9 | ELSA-2025-3628 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.9-r0 | — |
Advisories 48
- ALSA-2025:3556 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4169 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:3582 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4170 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:4030 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:3556 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:7491 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7493 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4169 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4170 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4032 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4031 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4028 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4029 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4027 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4026 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3628 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3623 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3621 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3620 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3590 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3589 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3587 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3581 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:3582 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5891-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5889-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4109-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4110-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:1157-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14971-1 MozillaFirefox-137.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14966-1 MozillaThunderbird-128.9.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14961-1 firefox-esr-128.9.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1138-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0675 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 2, 2026
- RLSA-2025:4170 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:3582 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-7493 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ELSA-2025-7491 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- SUSE-SU-2025:1103-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2025-2840 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 30, 2025
- ALAS2023-2025-943 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 29, 2025
- ELSA-2025-4169 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 24, 2025
- ELSA-2025-4170 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 24, 2025
- ELSA-2025-3628 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 22, 2025
- ELSA-2025-3556 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 3, 2025
- ELSA-2025-3582 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 3, 2025