CVE-2026-16375

—

CVSS 3.1

9.8 critical

EPSS

<1%p11

Published

Jul 21, 2026 (Jul 21, 2026)

Modified

Jul 24, 2026

Description

Site isolation issue in the Networking: HTTP 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-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 news0 stories

No ingested article mentions this CVE yet.