CVE-2026-8948

CRITICAL

Same-origin policy bypass in the DOM: Networking component

Title source: cna
STIX 2.1

Description

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

References (3)

Core 3

Scores

CVSS v3 9.1
EPSS 0.0003
EPSS Percentile 8.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-942
Status published
Products (4)
mozilla/firefox < 151.0.0
Mozilla/Firefox 151
mozilla/thunderbird < 151.0.0
Mozilla/Thunderbird 151
Published May 19, 2026
Tracked Since May 19, 2026