CVE-2026-109772

Same-origin policy bypass in the DevTools component

Published Oct 13, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
Weaknesses CWE-346
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
Weaknesses CWE-1033
CWE-285
Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox
Type Values Removed Values Added
Description Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158. Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
References
Type Values Removed Values Added
Weaknesses CWE-1033
CWE-285
Type Values Removed Values Added
Description Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158.
Title Same-origin policy bypass in the DevTools component
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Oct 26, 2026, 7:41 PM
Reserved
Oct 13, 2026, 12:48 AM
Status
Deferred
Published
Oct 13, 2026, 1:17 PM
Modified
Oct 26, 2026, 8:17 PM