PT-2026-21723 · Mozilla · Firefox+2
Surya Dev Singh
·
Published
2026-01-01
·
Updated
2026-03-18
·
CVE-2026-2790
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 148
Firefox ESR versions prior to 140.8
Thunderbird versions prior to 148
Thunderbird versions prior to 140.8
Description
A same-origin policy bypass exists in the Networking: JAR component. This allows potential circumvention of web security measures.
Recommendations
Update Firefox to version 148 or later.
Update Firefox ESR to version 140.8 or later.
Update Thunderbird to version 148 or later.
Update Thunderbird to version 140.8 or later.
Fix
Origin Validation Error
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Weakness Enumeration
Related Identifiers
Affected Products
Firefox
Firefox Esr
Thunderbird