Description
A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 128.7 |
| Mozilla | Thunderbird | — | 128.7 |
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 | 128.7.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.7.0esr-1 | — |
| Debian 13 | firefox-esr | 128.7.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.7.0esr-1 | — |
| Debian 12 | firefox-esr | 128.7.0esr-1~deb12u1 | DSA-5858-1 |
| Debian 12 | thunderbird | 1:128.7.0esr-1~deb12u1 | DSA-5861-1 |
| Debian 11 | firefox-esr | 128.7.0esr-1~deb11u1 | DLA-4044-1 |
| Debian 11 | thunderbird | 1:128.7.0esr-1~deb11u1 | DLA-4045-1 |
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 | firefox | 135.0+build2-0ubuntu0.20.04.1 | USN-7263-1 |
| 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 9 | firefox +2 | 128.7.0-1.el9_5 | RHSA-2025:1184, RHSA-2025:1066 |
| RHEL 8 | firefox +1 | 128.7.0-1.el8_10 | RHSA-2025:1292, RHSA-2025:1283 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 128.7.0-1.el9_4 | RHSA-2025:1318, RHSA-2025:1140 |
| RHEL 9.2 EUS | firefox +2 | 128.7.0-1.el9_2 | RHSA-2025:1317, RHSA-2025:1139 |
| RHEL 9.0 E4S | firefox +1 | 128.7.0-1.el9_0 | RHSA-2025:1319, RHSA-2025:1138 |
| RHEL 8.8 EUS | firefox +1 | 128.7.0-1.el8_8 | RHSA-2025:1340, RHSA-2025:1137 |
| RHEL 8.6 TUS | firefox +1 | 128.7.0-1.el8_6 | RHSA-2025:1341, RHSA-2025:1136 |
| RHEL 8.6 E4S | firefox +1 | 128.7.0-1.el8_6 | RHSA-2025:1341, RHSA-2025:1136 |
| RHEL 8.6 AUS | firefox +1 | 128.7.0-1.el8_6 | RHSA-2025:1341, RHSA-2025:1136 |
| RHEL 8.4 TUS | firefox +1 | 128.7.0-1.el8_4 | RHSA-2025:1339, RHSA-2025:1135 |
| RHEL 8.4 E4S | firefox +1 | 128.7.0-1.el8_4 | RHSA-2025:1339, RHSA-2025:1135 |
| RHEL 8.4 AUS | firefox +1 | 128.7.0-1.el8_4 | RHSA-2025:1339, RHSA-2025:1135 |
| RHEL 8.2 AUS | firefox +1 | 128.7.0-1.el8_2 | RHSA-2025:1348, RHSA-2025:1133 |
| RHEL 7 ELS | firefox | 128.7.0-1.el7_9 | RHSA-2025:1132 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 128.7.0-1.el9_5 | ALSA-2025:1066 |
| AlmaLinux 9 | thunderbird | 128.7.0-1.el9_5.alma.1 | ALSA-2025:1184 |
| AlmaLinux 8 | firefox | 128.7.0-1.el8_10 | ALSA-2025:1283 |
| AlmaLinux 8 | thunderbird | 128.7.0-1.el8_10.alma.1 | ALSA-2025:1292 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | firefox +1 | 128.7.0-1.el8_10 | RLSA-2025:1292, RLSA-2025:1283 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.7.0-150200.8.200.1 | SUSE-SU-2025:0405-1 |
| SLES 15 SP5 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLES 15 SP4 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLES 15 SP3 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLES 12 SP5 | MozillaFirefox | 128.7.0-112.246.1 | SUSE-SU-2025:0391-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 135.0-1.1 | openSUSE-SU-2025:14730-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 128.7.0-1.1 | openSUSE-SU-2025:14731-1, openSUSE-SU-2025:14727-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.7.0-150200.152.170.1 | SUSE-SU-2025:0374-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.7.0-150200.8.200.1 | SUSE-SU-2025:0405-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 128.7.0-1.amzn2.0.2 | ALAS2-2025-2789 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +2 | 128.7.0-1.0.1.el9_5 | ELSA-2025-1184, ELSA-2025-1066 |
| Oracle Linux 8 | firefox +1 | 128.7.0-1.0.1.el8_10 | ELSA-2025-1292, ELSA-2025-1283 |
| Oracle Linux 7 | firefox | 128.7.0-1.0.1.el7_9 | ELSA-2025-1132 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 135.0-r0 | — |
Advisories 45
- ALSA-2025:1184 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:1066 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:1283 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:1292 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-7263-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- RHSA-2025:1341 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1348 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1339 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1340 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1319 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1317 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1318 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1292 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1283 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1184 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1140 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1138 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1139 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1136 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1137 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1135 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1132 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1133 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- RHSA-2025:1066 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Apr 14, 2026
- DSA-5858-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5861-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4045-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4044-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2025:1292 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2025:1283 Important: firefox security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2025:0405-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14731-1 MozillaThunderbird-128.7.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14730-1 MozillaFirefox-135.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0374-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14727-1 firefox-esr-128.7.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0391-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0262 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 2, 2026
- ALAS2-2025-2789 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 7, 2025
- ELSA-2025-1132 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 12, 2025
- ELSA-2025-1292 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 11, 2025
- ELSA-2025-1283 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 11, 2025
- ELSA-2025-1184 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Feb 10, 2025
- NCSC-2025-0040 Kwetsbaarheden verholpen in Mozilla Firefox en Thunderbird NCSC-NL (Netherlands) · Feb 7, 2025
- ELSA-2025-1066 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Feb 5, 2025