Description
Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.23 |
| Mozilla | Thunderbird | — | 128.10 |
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.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | firefox +1 | 128.10.0-1.el10_0 | RHSA-2025:7507, RHSA-2025:7506 |
| RHEL 9 | firefox +2 | 128.10.0-1.el9_5 | RHSA-2025:7428, RHSA-2025:4460, RHSA-2025:4443 |
| RHEL 8 | firefox +1 | 128.10.0-1.el8_10 | RHSA-2025:4797, RHSA-2025:4458 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 128.10.0-1.el9_4 | RHSA-2025:7695, RHSA-2025:4756 |
| RHEL 9.2 EUS | firefox +2 | 128.10.0-1.el9_2 | RHSA-2025:7694, RHSA-2025:4752 |
| RHEL 9.0 E4S | firefox +1 | 128.10.0-1.el9_0 | RHSA-2025:7692, RHSA-2025:4753 |
| RHEL 8.8 EUS | firefox +1 | 128.10.0-1.el8_8 | RHSA-2025:7689, RHSA-2025:7543 |
| RHEL 8.6 TUS | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.6 E4S | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.6 AUS | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.4 TUS | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.4 E4S | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.4 AUS | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.2 AUS | firefox +1 | 128.10.0-1.el8_2 | RHSA-2025:7693, RHSA-2025:7547 |
| RHEL 7 ELS | firefox | 128.10.0-1.el7_9 | RHSA-2025:4751 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 128.10.0-1.el10_0 | ALSA-2025:7506 |
| AlmaLinux 10 | thunderbird | 128.10.0-1.el10_0.alma.1 | ALSA-2025:7507 |
| AlmaLinux 9 | firefox +2 | 128.10.0-1.el9_5.alma.1 | ALSA-2025:7428, ALSA-2025:4460, ALSA-2025:4443 |
| AlmaLinux 8 | firefox +1 | 128.10.0-1.el8_10.alma.1 | ALSA-2025:4797, ALSA-2025:4458 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox +1 | 128.10.0-1.el9_5 | RLSA-2025:7428, RLSA-2025:4460, RLSA-2025:4443 |
| Rocky Linux 8 | firefox +1 | 128.10.0-1.el8_10 | RLSA-2025:4797, RLSA-2025:4458 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.10.0-150200.8.212.1 | SUSE-SU-2025:1506-1 |
| SLES 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 12 SP5 | MozillaFirefox | 128.10.0-112.255.1 | SUSE-SU-2025:1414-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 138.0-1.1 | openSUSE-SU-2025:15045-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 128.10.0-1.1 | openSUSE-SU-2025:15042-1, openSUSE-SU-2025:15040-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.10.0-150200.8.212.1 | SUSE-SU-2025:1506-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 128.11.0-1.0.1.el10_0 | ELSA-2025-7507, ELSA-2025-7506 |
| Oracle Linux 9 | firefox +2 | 128.10.0-1.0.1.el9_5 | ELSA-2025-7428, ELSA-2025-4460, ELSA-2025-4443 |
| Oracle Linux 8 | firefox +1 | 128.10.0-1.0.1.el8_10 | ELSA-2025-4797, ELSA-2025-4458 |
| Oracle Linux 7 | firefox | 128.10.0-1.0.1.el7_9 | ELSA-2025-4751 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.10-r0 | — |
Advisories 50
- ALSA-2025:7506 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7507 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7428 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4460 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4443 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4797 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4458 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:7693 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:4458 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:7694 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7695 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7692 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7691 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7690 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7689 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7545 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7547 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7544 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7543 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7506 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7507 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7428 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4797 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4756 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4752 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4753 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4751 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4460 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4443 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- openSUSE-SU-2025:15042-1 MozillaThunderbird-128.10.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15045-1 MozillaFirefox-138.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:1414-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1436-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1506-1 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
- WID-SEC-2025-0901 Mozilla Firefox, Firefox ESR, Thunderbird and Thunderbird ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 29, 2025
- RLSA-2025:4443 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4460 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:7428 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4797 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4458 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-7507 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ELSA-2025-7506 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ELSA-2025-4751 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 30, 2025
- ELSA-2025-7428 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 21, 2025
- ELSA-2025-4797 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 12, 2025
- openSUSE-SU-2025:15040-1 firefox-esr-128.10.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- NCSC-2025-0142 Kwetsbaarheden verholpen in Mozilla Firefox en Thunderbird NCSC-NL (Netherlands) · May 6, 2025
- ELSA-2025-4458 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 6, 2025
- ELSA-2025-4443 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 5, 2025
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1917536
- https://www.mozilla.org/security/advisories/mfsa2025-28/
- https://www.mozilla.org/security/advisories/mfsa2025-29/
- https://www.mozilla.org/security/advisories/mfsa2025-30/
- https://www.mozilla.org/security/advisories/mfsa2025-31/
- https://www.mozilla.org/security/advisories/mfsa2025-32/