CVE-2026-6760

CRITICAL

Mitigation bypass in the Networking: Cookies component

Title source: cna

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

CVSS v3 9.8

EPSS 0.0005

EPSS Percentile 16.8%

Attack Vector NETWORK

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

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

CWE

CWE-288

Status published

Products (4)

mozilla/firefox < 150.0

Mozilla/Firefox 150

mozilla/thunderbird < 150.0

Mozilla/Thunderbird 150

Published Apr 21, 2026

Tracked Since Apr 21, 2026