PT-2026-77019 · Mozilla · Firefox+2
CVSS v3.1
9.1
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 154
Firefox ESR versions prior to 153.1
Thunderbird versions prior to 154
Thunderbird versions prior to 153.1
Description
A site isolation issue exists within the CSS Parsing and Computation component. Site isolation is a security mechanism that ensures web pages from different sites are processed in separate processes to prevent data leakage.
Recommendations
Update Firefox to version 154.
Update Firefox ESR to version 153.1.
Update Thunderbird to version 154.
Update Thunderbird to version 153.1.
Fix
Information Disclosure
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Weakness Enumeration
Related Identifiers
Affected Products
Firefox
Firefox Esr
Thunderbird