CVE-2026-8948

high

Description

Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

References

https://www.mozilla.org/security/advisories/mfsa2026-50/

https://www.mozilla.org/security/advisories/mfsa2026-46/

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8948.json

https://bugzilla.redhat.com/show_bug.cgi?id=2479850

https://bugzilla.mozilla.org/show_bug.cgi?id=2038803

https://access.redhat.com/security/cve/CVE-2026-8948

Details

Source: Mitre, NVD

Published: 2026-05-19

Updated: 2026-06-30

Risk Information

CVSS v2

Base Score: 9.4

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

Severity: High

CVSS v3

Base Score: 7.5

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

Severity: High

EPSS

EPSS: 0.00028