VULNERABILITY INTELLIGENCE

CVE-2026-84140

CVSS score9.8 CRITICAL
EPSS probability0.18%
CISA KEVNot currently listed
Published2026-09-01
Last modified2026-09-03
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Weakness classification

  • nvd@nist.gov: CWE-346
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-346

Primary references