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CVE-2026-16387

—
CVSS 3.1
9.8 critical
EPSS
<1%p10
Published
()
Modified
Description

Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Vendors
mozilla
Products
firefox, thunderbird
Weakness
CWE-200, CWE-284, CWE-346
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD CVE.org GitHub PoCs EPSS (0.2%)

In the news

No ingested article mentions this CVE yet.