PT-2026-111460
CVE-2026-109739
·
Published
2026-10-13
·
Updated
2026-10-20
Description by
CVSS 3.1
8.8
HighMetricsAV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 158
Thunderbird versions prior to 158
Description
Privilege escalation exists within the WebExtensions component, which allows extensions to gain higher permissions than intended.
Recommendations
Update Firefox to version 158 or later.
Update Thunderbird to version 158 or later.
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