CVE-2026-15719

Site isolation issue in the DOM: Navigation component

Medium · published July 14, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
26.1
In the wild
Unconfirmed
What it is

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00339 · 26.1th percentile
Published
2026-07-14T12:15Z
EPSS history
Timeline
  • 14 JUL 12:15Z
    Site isolation issue in the DOM: Navigation component
    cvelistv5