vulnerability
Alma Linux: CVE-2025-5266: Important: firefox security update (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:P/I:N/A:N) | May 27, 2025 | May 30, 2025 | Apr 20, 2026 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
May 27, 2025
Added
May 30, 2025
Modified
Apr 20, 2026
Description
Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Solutions
alma-upgrade-firefoxalma-upgrade-firefox-x11alma-upgrade-thunderbird
References
- CVE-2025-5266
- https://attackerkb.com/topics/CVE-2025-5266
- CWE-200
- EUVD-EUVD-2025-18107
- https://errata.almalinux.org/8/ALSA-2025-8308.html
- https://errata.almalinux.org/8/ALSA-2025-8756.html
- https://errata.almalinux.org/9/ALSA-2025-8293.html
- https://errata.almalinux.org/9/ALSA-2025-8607.html
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-18107
Rapid7 Labs
2026 Global Threat Landscape Report
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