CVE-2026-109755

Sandbox escape in the DOM: Content Processes component

Published Oct 13, 2026 CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Description
Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
Weaknesses CWE-693
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}

ssvc

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

Type Values Removed Values Added
Description Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158. Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
References
Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox
Type Values Removed Values Added
Description Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158.
Title Sandbox escape in the DOM: Content Processes component
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Oct 15, 2026, 7:55 PM
Reserved
Oct 13, 2026, 12:29 AM
Status
Deferred
Published
Oct 13, 2026, 1:17 PM
Modified
Oct 15, 2026, 8:17 PM