CVE-2026-16398

HIGH

Mozilla Firefox - Site Isolation Issue in the Graphics Component

Title source: rule
STIX 2.1

Description

Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0015
EPSS Percentile 4.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-200 CWE-346
Status published
Products (4)
mozilla/firefox < 153.0.0
Mozilla/Firefox 153
mozilla/thunderbird < 153.0
Mozilla/Thunderbird 153
Published Jul 21, 2026
Tracked Since Jul 21, 2026