CVE-2026-6755

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

6.5 / 10

Vector String

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

Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Published Date

April 21, 2026

Last Modified

April 22, 2026

CWE ID

CWE-352

Source

NVD

Vendor

mozilla

Product

firefox