CVE-2026-109759

HighCVSS 8.1/10Last modified Oct 19, 2026

Description

Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-346

Affected software

No affected versions have been published.

Timeline

Published
Oct 13, 2026
Last modified
Oct 19, 2026
NVD status
Deferred

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CVE-2026-109759: High severity, CVSS 8.1 | Vulnix