CVE-2026-8964

Spoofing issue in the Popup Blocker component

High · published May 19, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
32.0
In the wild
Unconfirmed
What it is

Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

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:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00391 · 32.0th percentile
Published
2026-05-19T12:30Z
EPSS history
Timeline
  • 19 MAY 12:30Z
    Spoofing issue in the Popup Blocker component
    cvelistv5