CVE-2026-16381

critical

Description

Same-origin policy bypass in the Networking: DNS component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

References

https://www.mozilla.org/security/advisories/mfsa2026-70/

https://www.mozilla.org/security/advisories/mfsa2026-68/

https://bugzilla.mozilla.org/show_bug.cgi?id=2041001

Details

Source: Mitre, NVD

Published: 2026-07-21

Updated: 2026-07-21

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: Critical