CVE-2026-16398

Site isolation issue in the Graphics component

High · published July 21, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
3.8
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00149 · 3.8th percentile
Published
2026-07-21T12:38Z
EPSS history
Timeline
  • 21 JUL 12:38Z
    Site isolation issue in the Graphics component
    cvelistv5