Description
On Windows 10, when using the 'Save As' functionality, an attacker could have tricked the browser into saving the file with a disallowed extension such as `.url` by including an invalid character in the extension. *Note:* This issue only affected Windows operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 127 | 127 |
| Mozilla | Firefox ESR | unspecified – < 115.12 | 115.12 |
| Mozilla | Thunderbird | unspecified – < 115.12 | 115.12 |
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.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP6 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
| SLES 15 SP5 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
| SLES 15 SP4 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP3 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP2 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 115.12.0-112.215.1 | SUSE-SU-2024:2371-1, SUSE-SU-2024:2012-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.12.0-112.215.1 | SUSE-SU-2024:2371-1, SUSE-SU-2024:2012-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 127.0-1.1 | openSUSE-SU-2024:14044-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.12.0-1.1 | openSUSE-SU-2024:14049-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 127.0.2-r0 | — |
Advisories 9
- openSUSE-SU-2024:14044-1 MozillaFirefox-127.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2073-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2399-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2061-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14049-1 MozillaThunderbird-115.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2371-1 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
- SUSE-SU-2024:2012-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-1346 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024