CVE-2026-6755

MEDIUM

Mitigation bypass in the DOM: postMessage component

Title source: cna
STIX 2.1

Description

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

References (3)

Scores

CVSS v3 6.5
EPSS 0.0002
EPSS Percentile 5.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-352
Status published
Products (4)
mozilla/firefox < 150.0
Mozilla/Firefox 150
mozilla/thunderbird < 150.0
Mozilla/Thunderbird 150
Published Apr 21, 2026
Tracked Since Apr 21, 2026