Description
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 153.5 |
| Mozilla | Thunderbird | — | 153.5 |
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 | 153.5.0esr-1 | — |
| Debian 14 | thunderbird | 1:153.5.0esr-1 | — |
| Debian 13 | firefox-esr | 153.5.0esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:153.5.1esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 153.5.0esr-1~deb12u1 | — |
| Debian 12 | thunderbird | 1:153.5.1esr-1~deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +3 | No fix yet | — |
| 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 | thunderbird | 153.5.0-1.el9_8 | RHSA-2026:93443 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 153.5.0-1.el10_0 | RHSA-2026:99050, RHSA-2026:98952 |
| RHEL 9.6 EUS | firefox +2 | 153.5.0-1.el9_6 | RHSA-2026:98124, RHSA-2026:95596 |
| RHEL 9.4 E4S | firefox +2 | 153.5.0-1.el9_4 | RHSA-2026:98123, RHSA-2026:95597 |
| RHEL 9.2 E4S | firefox +2 | 153.5.0-1.el9_2 | RHSA-2026:99749, RHSA-2026:98128 |
| RHEL 8.8 TUS | firefox | 153.5.0-1.el8_8 | RHSA-2026:99070 |
| RHEL 8.8 E4S | firefox | 153.5.0-1.el8_8 | RHSA-2026:99070 |
| RHEL 8.6 EUS Long Life | firefox | 153.5.0-1.el8_6 | RHSA-2026:99013 |
| RHEL 8.6 AUS | firefox | 153.5.0-1.el8_6 | RHSA-2026:99013 |
| RHEL 8.4 EUS Long Life | firefox | 153.5.0-1.el8_4 | RHSA-2026:99510 |
| RHEL 8.4 AUS | firefox | 153.5.0-1.el8_4 | RHSA-2026:99510 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | thunderbird | 153.5.0-1.el9_8.alma.1 | ALSA-2026:93443 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | thunderbird | 153.5.0-1.el9_8 | RLSA-2026:93443 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP7 | MozillaThunderbird | 153.5.0-150400.13.9.1 | SUSE-SU-2026:4736-1 |
| SLES 15 SP6 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 12 SP5 | MozillaFirefox | 153.5.0-118.16.2 | SUSE-SU-2026:4806-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLES 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 158.0-1.1 | openSUSE-SU-2026:12190-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 153.5.1-1.1 | openSUSE-SU-2026:12224-1 |
| openSUSE Tumbleweed | firefox-esr | 153.5.0-1.1 | openSUSE-SU-2026:12116-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.5.0-160000.1.1 | openSUSE-SU-2026:22139-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 153.5.0-1.amzn2023.0.1 | ALAS2023-2026-3281 |
| Amazon Linux 2 | thunderbird | 153.5.1-1.amzn2.0.1 | ALAS2-2026-4057 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | thunderbird | 153.5.0-1.0.1.el9_8 | ELSA-2026-93443 |
Advisories 26
- RHSA-2026:99510 Red Hat Security Advisory: firefox security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:95596 Red Hat Security Advisory: thunderbird security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:93443 Red Hat Security Advisory: thunderbird security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98124 Red Hat Security Advisory: firefox security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98952 Red Hat Security Advisory: firefox security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99070 Red Hat Security Advisory: firefox security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98123 Red Hat Security Advisory: firefox security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99749 Red Hat Security Advisory: thunderbird security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99050 Red Hat Security Advisory: thunderbird security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:95597 Red Hat Security Advisory: thunderbird security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98128 Red Hat Security Advisory: firefox security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99013 Red Hat Security Advisory: firefox security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- WID-SEC-2026-3942 Mozilla Firefox und Thunderbrid: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- RLSA-2026:93443 Important: thunderbird security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 3, 2026
- ALSA-2026:93443 Important: thunderbird security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 2, 2026
- ALAS2-2026-4057 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- ELSA-2026-93443 Important: thunderbird security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 2, 2026
- ALAS2023-2026-3281 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- openSUSE-SU-2026:12224-1 MozillaThunderbird-153.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Oct 23, 2026
- SUSE-SU-2026:24260-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 23, 2026
- openSUSE-SU-2026:22139-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 22, 2026
- SUSE-SU-2026:4834-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 22, 2026
- SUSE-SU-2026:4806-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:12190-1 MozillaFirefox-158.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:4736-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Oct 20, 2026
- openSUSE-SU-2026:12116-1 firefox-esr-153.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 14, 2026