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

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

No data.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=1880429 cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-30/ cve-icon cve-icon
History

Tue, 21 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-352
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 21 Apr 2026 13:15:00 +0000

Type Values Removed Values Added
Description Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150.
Title Mitigation bypass in the DOM: postMessage component
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-04-21T13:47:18.972Z

Reserved: 2026-04-21T12:40:51.062Z

Link: CVE-2026-6755

cve-icon Vulnrichment

Updated: 2026-04-21T13:47:11.033Z

cve-icon NVD

Status : Received

Published: 2026-04-21T13:16:21.510

Modified: 2026-04-21T13:16:21.510

Link: CVE-2026-6755

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.