Description
The Firefox updater created a directory writable by non-privileged users. When uninstalling Firefox, any files in that directory would be recursively deleted with the permissions of the uninstalling user account. This could be combined with creation of a junction (a form of symbolic link) to allow arbitrary file deletion controlled by the non-privileged user.
*This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 116, Firefox ESR < 115.1, and Thunderbird < 115.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 116 | 116 |
| Mozilla | Firefox ESR | unspecified – < 115.1 | 115.1 |
| Mozilla | Thunderbird | unspecified – < 115.1 | 115.1 |
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 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | 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 SP5 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.1.0-150200.8.127.1 | SUSE-SU-2023:3228-1 |
| SLES 15 SP4 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLES 15 SP4 | MozillaThunderbird | 115.1.0-150200.8.127.1 | SUSE-SU-2023:3228-1 |
| SLES 15 SP3 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLES 15 SP2 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLES 15 SP1 | MozillaFirefox | 115.1.0-150000.150.97.1 | SUSE-SU-2023:3163-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 115.1.0-112.173.1 | SUSE-SU-2023:3161-1 |
| SLES 12 SP2 | MozillaFirefox | 115.1.0-112.173.1 | SUSE-SU-2023:3161-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 115.1.0-150000.150.97.1 | SUSE-SU-2023:3163-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.1.0-112.173.1 | SUSE-SU-2023:3161-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 115.1.0-150000.150.97.1 | SUSE-SU-2023:3163-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 116.0.2-1.1 | openSUSE-SU-2024:13124-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.2.0-1.1 | openSUSE-SU-2024:13202-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.1.0-150200.8.127.1 | SUSE-SU-2023:3228-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 115.1.0-150200.152.99.1 | SUSE-SU-2023:3162-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 115.1.0-150200.8.127.1 | SUSE-SU-2023:3228-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 115.1.0-r0 | — |
| Alpine v3.22 | firefox-esr | 115.1.0-r0 | — |
| Alpine v3.21 | firefox-esr | 115.1.0-r0 | — |
| Alpine v3.20 | firefox-esr | 115.1.0-r0 | — |
| Alpine v3.19 | firefox-esr | 115.1.0-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 115.1.0-r0 | — |
Advisories 8
- SUSE-SU-2023:3162-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3163-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13202-1 MozillaThunderbird-115.2.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13124-1 MozillaFirefox-116.0.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3228-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3161-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1934 Mozilla Firefox und Mozilla Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 3, 2024