Description
Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 140.13 |
| Mozilla | Thunderbird | — | 140.13 |
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 | 140.13.0esr-1 | — |
| Debian 14 | thunderbird | 1:140.13.0esr-1 | — |
| Debian 13 | firefox-esr | 140.13.0esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:140.13.0esr-2~deb13u1 | — |
| Debian 12 | firefox-esr | 140.13.0esr-1~deb12u1 | — |
| Debian 12 | thunderbird | 1:140.13.0esr-2~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 10 | firefox +1 | 140.13.0-1.el10_2 | RHSA-2026:49621, RHSA-2026:47101 |
| RHEL 9 | firefox +2 | 140.13.0-1.el9_8 | RHSA-2026:49921, RHSA-2026:47104 |
| RHEL 8 | firefox +1 | 140.13.0-1.el8_10 | RHSA-2026:49922, RHSA-2026:47105 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.13.0-1.el10_0 | RHSA-2026:54181, RHSA-2026:53445 |
| RHEL 9.6 EUS | firefox +2 | 140.13.0-1.el9_6 | RHSA-2026:54249, RHSA-2026:53446 |
| RHEL 9.4 E4S | firefox +2 | 140.13.0-1.el9_4 | RHSA-2026:54182, RHSA-2026:53444 |
| RHEL 9.2 E4S | firefox +2 | 140.13.0-1.el9_2 | RHSA-2026:54185, RHSA-2026:53475 |
| RHEL 8.8 TUS | firefox +1 | 140.13.0-1.el8_8 | RHSA-2026:54339, RHSA-2026:53454 |
| RHEL 8.8 E4S | firefox +1 | 140.13.0-1.el8_8 | RHSA-2026:54339, RHSA-2026:53454 |
| RHEL 8.6 EUS Long Life | firefox +1 | 140.13.0-1.el8_6 | RHSA-2026:54259, RHSA-2026:53453 |
| RHEL 8.6 AUS | firefox +1 | 140.13.0-1.el8_6 | RHSA-2026:54259, RHSA-2026:53453 |
| RHEL 8.4 EUS Long Life | firefox +1 | 140.13.0-1.el8_4 | RHSA-2026:54180, RHSA-2026:53455 |
| RHEL 8.4 AUS | firefox +1 | 140.13.0-1.el8_4 | RHSA-2026:54180, RHSA-2026:53455 |
| RHEL 7 ELS | firefox | 140.13.0-1.el7_9 | RHSA-2026:54248 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.13.0-1.el10_2 | ALSA-2026:47101 |
| AlmaLinux 10 | thunderbird | 140.13.0-1.el10_2.alma.1 | ALSA-2026:49621 |
| AlmaLinux 9 | firefox +2 | 140.13.0-1.el9_8.alma.1 | ALSA-2026:49921, ALSA-2026:47104 |
| AlmaLinux 8 | firefox +1 | 140.13.0-1.el8_10.alma.1 | ALSA-2026:49922, ALSA-2026:47105 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox +1 | 140.13.0-1.el10_2 | RLSA-2026:49621, RLSA-2026:47101 |
| Rocky Linux 9 | firefox +1 | 140.13.0-1.el9_8 | RLSA-2026:49921, RLSA-2026:47104 |
| Rocky Linux 8 | firefox +1 | 140.13.0-1.el8_10 | RLSA-2026:49922, RLSA-2026:47105 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLES 15 SP7 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP7 | MozillaThunderbird | 140.13.0-150200.8.280.1 | SUSE-SU-2026:4268-1, SUSE-SU-2026:3546-1 |
| SLES 15 SP7 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP7 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP6 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLES 15 SP6 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP6 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP6 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP5 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLES 15 SP5 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP4 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLES 15 SP4 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 12 SP5 | MozillaFirefox | 140.13.0-112.324.2 | SUSE-SU-2026:4140-1, SUSE-SU-2026:3200-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 153-41.3.8 | SUSE-SU-2026:4140-1 |
| SLES 12 SP5 | mozilla-nspr | 4.39-19.39.1 | SUSE-SU-2026:4140-1 |
| SLES 12 SP5 | mozilla-nss | 3.125-58.147.1 | SUSE-SU-2026:4140-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 140.13.0-160000.1.1 | SUSE-SU-2026:23590-1, SUSE-SU-2026:23137-1, SUSE-SU-2026:23115-1 |
| SLES for SAP 16.0 | MozillaFirefox-branding-SLE | 153-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLES for SAP 16.0 | mozilla-nspr | 4.39-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLES for SAP 16.0 | mozilla-nss | 3.125-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLES for SAP 16.0 | rust-cbindgen | 0.29.4+git0-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLES for SAP 15 SP6 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP6 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP6 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLES for SAP 15 SP5 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLES for SAP 15 SP4 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLES for SAP 15 SP4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLES 16.0 | MozillaFirefox | 140.13.0-160000.1.1 | SUSE-SU-2026:23590-1, SUSE-SU-2026:23137-1, SUSE-SU-2026:23115-1 |
| SLES 16.0 | MozillaFirefox-branding-SLE | 153-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLES 16.0 | mozilla-nspr | 4.39-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLES 16.0 | mozilla-nss | 3.125-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLES 16.0 | rust-cbindgen | 0.29.4+git0-160000.1.1 | SUSE-SU-2026:23590-1 |
| SLE Micro 6.2 | mozilla-nspr | 4.39-160000.1.1 | SUSE-SU-2026:23411-1 |
| SLE Micro 6.2 | mozilla-nss | 3.125-160000.1.1 | SUSE-SU-2026:23411-1 |
| SLE Micro 5.5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.3 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE Micro 5.3 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLE HPC 15 SP5 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP5 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP5 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 140.13.0-150200.152.248.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3221-1 |
| SLE HPC 15 SP4 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP4 | mozilla-nspr | 4.39-150400.12.3.1 | SUSE-SU-2026:4156-1 |
| SLE HPC 15 SP4 | mozilla-nss | 3.125-150400.3.74.1 | SUSE-SU-2026:4156-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 153.0-1.1 | openSUSE-SU-2026:11358-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.13.0-1.1 | openSUSE-SU-2026:11359-1, openSUSE-SU-2026:11329-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 140.13.0-160000.1.1 | openSUSE-SU-2026:21713-1, openSUSE-SU-2026:21519-1 |
| openSUSE Leap 16.0 | mozilla-nspr | 4.39-160000.1.1 | openSUSE-SU-2026:21713-1 |
| openSUSE Leap 16.0 | mozilla-nss | 3.125-160000.1.1 | openSUSE-SU-2026:21713-1 |
| openSUSE Leap 16.0 | rust-cbindgen | 0.29.4+git0-160000.1.1 | openSUSE-SU-2026:21713-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.13.0-1.amzn2023.0.1 | ALAS2023-2026-2069 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 140.13.0-1.0.1.el10_2 | ELSA-2026-49621, ELSA-2026-47101 |
| Oracle Linux 9 | firefox +2 | 140.13.0-1.0.1.el9_8 | ELSA-2026-49921, ELSA-2026-47104 |
| Oracle Linux 8 | firefox +1 | 140.13.0-1.0.1.el8_10 | ELSA-2026-49922, ELSA-2026-47105 |
| Oracle Linux 7 | firefox | 140.13.0-1.0.1.el7_9 | ELSA-2026-54248 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox +1 | 153.0-r0 | — |
Advisories 50
- WID-SEC-2026-2458 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ALSA-2026:47104 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:49921 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:49621 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:47101 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:49922 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:47105 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:54339 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54259 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54248 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54249 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54185 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54181 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54182 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54180 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:47105 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:47104 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SUSE-SU-2026:23590-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr, rust-cbindgen SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:4140-1 Security update for MozillaFirefox, mozilla-nspr, mozilla-nss, rust-cbindgen SUSE / openSUSE Security Updates · Sep 28, 2026
- ELSA-2026-54248 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 21, 2026
- SUSE-SU-2026:4268-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Sep 19, 2026
- SUSE-SU-2026:4156-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE, mozilla-nspr, mozilla-nss, rust-cbindgen SUSE / openSUSE Security Updates · Sep 15, 2026
- SUSE-SU-2026:23411-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr, rust-cbindgen SUSE / openSUSE Security Updates · Sep 10, 2026
- RHSA-2026:53444 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:53445 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:53446 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:53453 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:53454 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:53455 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:53475 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:47101 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:49921 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:49922 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:49621 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- openSUSE-SU-2026:21713-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr, rust-cbindgen SUSE / openSUSE Security Updates · Sep 2, 2026
- ALAS2023-2026-2069 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 17, 2026
- SUSE-SU-2026:23137-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:23115-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:3546-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Aug 11, 2026
- RLSA-2026:49921 Important: thunderbird security update Rocky Linux Security Advisories · Aug 6, 2026
- RLSA-2026:49621 Important: thunderbird security update Rocky Linux Security Advisories · Aug 6, 2026
- RLSA-2026:49922 Important: thunderbird security update Rocky Linux Security Advisories · Aug 6, 2026
- openSUSE-SU-2026:21519-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 4, 2026
- ELSA-2026-49921 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 4, 2026
- ELSA-2026-49922 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 4, 2026
- RLSA-2026:47104 Important: firefox security update Rocky Linux Security Advisories · Aug 3, 2026
- ELSA-2026-49621 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Aug 3, 2026
- RLSA-2026:47101 Important: firefox security update Rocky Linux Security Advisories · Jul 30, 2026
- RLSA-2026:47105 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2026
- ELSA-2026-47104 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 29, 2026