Description
Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 153.1 |
| Mozilla | Thunderbird | — | 153.1 |
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.
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 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| SLES 15 SP7 | MozillaFirefox-branding-SLE | 153-150400.14.3.1 | SUSE-SU-2026:4156-1 |
| SLES 15 SP7 | MozillaThunderbird | 153.2.0-150400.13.3.1 | SUSE-SU-2026:4268-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 140.14.0-112.327.1 | SUSE-SU-2026:4140-1, SUSE-SU-2026:3683-1 |
| 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 | 153.1.0-160000.1.1 | SUSE-SU-2026:23590-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 153.1.0-160000.1.1 | SUSE-SU-2026:23590-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 140.14.0-150200.152.251.1 | SUSE-SU-2026:4156-1, SUSE-SU-2026:3658-1 |
| 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 | 154.0-1.1 | openSUSE-SU-2026:11580-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 153.4.0-1.1 | openSUSE-SU-2026:12098-1 |
| openSUSE Tumbleweed | firefox-esr | 153.1.0-1.1 | openSUSE-SU-2026:11546-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 153.1.0-160000.1.2 | openSUSE-SU-2026:21713-1 |
| 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 | 140.14.0-1.amzn2023.0.1 | ALAS2023-2026-2105 |
| Amazon Linux 2 | thunderbird | 140.14.0-1.amzn2.0.1 | ALAS2-2026-3880 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox +1 | 154.0-r0 | — |
Advisories 14
- WID-SEC-2026-2911 Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- openSUSE-SU-2026:12098-1 MozillaThunderbird-153.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Oct 11, 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
- 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
- openSUSE-SU-2026:21713-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr, rust-cbindgen SUSE / openSUSE Security Updates · Sep 2, 2026
- ALAS2-2026-3880 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2105 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- SUSE-SU-2026:3683-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 26, 2026
- openSUSE-SU-2026:11580-1 MozillaFirefox-154.0-1.1 on GA media SUSE / openSUSE Security Updates · Aug 24, 2026
- openSUSE-SU-2026:11546-1 firefox-esr-153.1.0-1.1 on GA media SUSE / openSUSE Security Updates · Aug 21, 2026
- SUSE-SU-2026:3658-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 21, 2026