by Kastro
Paper/Archive/CVE-2026-8948

CVE-2026-8948

Mozilla Firefox — Same-origin policy bypass in the DOM: Networking component

EPSS 0.4%CVSS 9.1
critical.is priorityof 100
35
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 36.4.364 × 207.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

Affected

ProductAffectedFixed inSource
Firefoxsee advisory151CNA
Thunderbirdsee advisory151CNA
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 6see advisory–redhat-SADP
Red Hat Enterprise Linux 6see advisory–redhat-SADP
Red Hat Enterprise Linux 7see advisory–redhat-SADP
Red Hat Enterprise Linux 7see advisory–redhat-SADP
Red Hat Enterprise Linux 8see advisory–redhat-SADP
Red Hat Enterprise Linux 8see advisory–redhat-SADP

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
redhat-SADP (CNA)7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2038803refmozilla.org/security/advisories/mfsa2026-46refmozilla.org/security/advisories/mfsa2026-50refaccess.redhat.com/security/cve/CVE-2026-8948refbugzilla.redhat.com/show_bug.cgi?id=2479850refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8948.json