PT-2025-22991 · Mozilla+11 · Firefox+11
Jakub Szymsza
·
Published
2025-05-27
·
Updated
2025-12-03
·
CVE-2025-5266
CVSS v2.0
6.4
Medium
| Vector | AV:N/AC:L/Au:N/C:P/I:P/A:N |
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 139
Firefox ESR versions prior to 128.11
Description
The issue arises from script elements loading cross-origin resources, which generate load and error events. These events leak information, enabling XS-Leaks attacks. XS-Leaks refer to a type of side-channel attack that involves exploiting the differences in behavior between same-origin and cross-origin requests to infer sensitive information.
Recommendations
For Firefox versions prior to 139, update to version 139 or later to resolve the issue.
For Firefox ESR versions prior to 128.11, update to version 128.11 or later to resolve the issue.
Fix
Information Disclosure
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Debian
Firefox
Linuxmint
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu