Description
When using the Performance API, an attacker was able to notice subtle differences between PerformanceEntries and thus learn whether the target URL had been subject to a redirect. This vulnerability affects Firefox < 103.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 103 | 103 |
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 | thunderbird | 1:102.2.2+build1-0ubuntu0.22.04.1 | — |
| Ubuntu 20.04 LTS | firefox | 103.0+build1-0ubuntu0.20.04.1 | USN-5536-1 |
| Ubuntu 20.04 LTS | thunderbird | 1:102.2.2+build1-0ubuntu0.20.04.1 | — |
| Ubuntu 18.04 LTS | firefox | 103.0+build1-0ubuntu0.18.04.1 | USN-5536-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 103.0.1-1.1 | openSUSE-SU-2024:12227-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 103.0-r0 | — |
| Alpine v3.23 | firefox +1 | 103.0-r0 | — |
| Alpine v3.22 | firefox +1 | 103.0-r0 | — |
| Alpine v3.21 | firefox +1 | 103.0-r0 | — |
| Alpine v3.20 | firefox | 103.0-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 103.0-r0 | — |
| Alpine v3.18 | firefox | 103.0-r0 | — |
| Alpine v3.17 | firefox | 103.0-r0 | — |
Advisories 4
- USN-5536-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:12227-1 MozillaFirefox-103.0.1-1.1 on GA media 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-2022-0837 Mozilla Firefox und Mozilla Firefox ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 10, 2024