Description
When downloading files on Windows, the % character was not escaped, which could have lead to a download incorrectly being saved to attacker-influenced paths that used variables such as %HOMEPATH% or %APPDATA%.<br>*This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 91.10 | 91.10 |
| Mozilla | Firefox | unspecified – < 101 | 101 |
| Mozilla | Firefox ESR | unspecified – < 91.10 | 91.10 |
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 22.04 LTS | mozjs78 +1 | 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 SP4 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SLES 15 SP4 | MozillaThunderbird | 91.10.0-150200.8.73.1 | SUSE-SU-2022:2062-1 |
| SLES 15 SP3 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SLES 15 SP3 | MozillaThunderbird | 91.10.0-150200.8.73.1 | SUSE-SU-2022:2062-1 |
| SLES 15 SP2 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SLES 15 SP1 | MozillaFirefox | 91.10.0-150000.150.44.1 | SUSE-SU-2022:1927-1 |
| SLES 15 | MozillaFirefox | 91.10.0-150000.150.44.1 | SUSE-SU-2022:1927-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SLES 12 SP4 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SLES 12 SP3 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SLES 12 SP2 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 91.10.0-150000.150.44.1 | SUSE-SU-2022:1927-1 |
| SLES for SAP 15 | MozillaFirefox | 91.10.0-150000.150.44.1 | SUSE-SU-2022:1927-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 91.10.0-150000.150.44.1 | SUSE-SU-2022:1927-1 |
| SLE HPC 15 | MozillaFirefox | 91.10.0-150000.150.44.1 | SUSE-SU-2022:1927-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SUSE Manager Server 4.1 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SUSE Manager Retail Branch Server 4.1 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SUSE Manager Proxy 4.1 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 91.10.0-112.114.1 | SUSE-SU-2022:1921-1 |
| SUSE Enterprise Storage 7 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| SUSE Enterprise Storage 6 | MozillaFirefox | 91.10.0-150000.150.44.1 | SUSE-SU-2022:1927-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 101.0-1.1 | openSUSE-SU-2024:12121-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.10.0-1.1 | openSUSE-SU-2024:12117-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 91.10.0-150200.8.73.1 | SUSE-SU-2022:2062-1 |
| openSUSE Leap 15.3 | MozillaFirefox | 91.10.0-150200.152.43.1 | SUSE-SU-2022:1920-1 |
| openSUSE Leap 15.3 | MozillaThunderbird | 91.10.0-150200.8.73.1 | SUSE-SU-2022:2062-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 101.0-r0 | — |
| Alpine v3.23 | firefox +1 | 101.0-r0 | — |
| Alpine v3.23 | firefox-esr +1 | 91.10.0-r0 | — |
| Alpine v3.22 | firefox +1 | 101.0-r0 | — |
| Alpine v3.22 | firefox-esr +1 | 91.10.0-r0 | — |
| Alpine v3.21 | firefox +1 | 101.0-r0 | — |
| Alpine v3.21 | firefox-esr +1 | 91.10.0-r0 | — |
| Alpine v3.20 | firefox | 101.0-r0 | — |
| Alpine v3.20 | firefox-esr +1 | 91.10.0-r0 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 101.0-r0 | — |
| Alpine v3.19 | firefox-esr +1 | 91.10.0-r0 | — |
| Alpine v3.18 | firefox | 101.0-r0 | — |
| Alpine v3.18 | firefox-esr +1 | 91.10.0-r0 | — |
| Alpine v3.17 | firefox | 101.0-r0 | — |
| Alpine v3.17 | firefox-esr +1 | 91.10.0-r0 | — |
| Alpine v3.16 | firefox | 101.0-r0 | — |
| Alpine v3.16 | firefox-esr +1 | 91.10.0-r0 | — |
| Alpine v3.15 | firefox-esr | 91.10.0-r0 | — |
Advisories 9
- SUSE-SU-2022:1920-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12117-1 MozillaThunderbird-91.10.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1921-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12121-1 MozillaFirefox-101.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2062-1 Security update for MozillaThunderbird 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-2022-1335 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- SUSE-SU-2022:1927-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2022-0019 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen ermöglichen Codeausführung BSI CERT-Bund (WID) · Jul 10, 2024