cve.bz

CVE-2026-84140

9.8 criticalEPSS 0.2%

Critical (9.8) in mozilla. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-31)
CWE
CWE-346
Published
Modified
Record from
the NVD, synced

Affected

References

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