CVE-2025-5266
Public on 2025-05-27
Modified on 2025-05-29
Description
Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Firefox Extra | firefox | 2025-06-11 | ALAS2FIREFOX-2025-039 | Fixed |
| Amazon Linux 2023 | firefox | 2025-06-10 | ALAS2023-2025-996 | Fixed |
| Amazon Linux 2 - Core | thunderbird | 2025-06-12 | ALAS2-2025-2873 | Fixed |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| NVD | CVSSv3 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |