Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Mozilla
  • Firefox
  • Thunderbird

Configuration 1 [-]

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

No data.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2064287 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-92018 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-92018 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-90/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-91/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-92/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92018 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-93/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-94/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-95/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92018 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-96/ cve-icon cve-icon
History

Tue, 06 Oct 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla thunderbird

Sun, 20 Sep 2026 01:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-693
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

 ssvc

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

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'}

Thu, 17 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Thu, 17 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-791
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

threat_severity

Important

Wed, 16 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
Description Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16. Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
References

Wed, 16 Sep 2026 05:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Tue, 15 Sep 2026 20:15:00 +0000

Type Values Removed Values Added
Description Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, and Thunderbird 140.16. Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
References

Tue, 15 Sep 2026 20:00:00 +0000

Type Values Removed Values Added
Description Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3. Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, and Thunderbird 140.16.
References

Tue, 15 Sep 2026 14:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 15 Sep 2026 12:45:00 +0000

Type Values Removed Values Added
Description Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
Title Sandbox escape in the DOM: Core & HTML component
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2026-09-15T12:33:38.091Z

Updated: 2026-09-20T00:15:48.795Z

Reserved: 2026-09-15T12:33:37.558Z

Link: CVE-2026-92018

cve-icon Vulnrichment

Updated: 2026-09-20T00:15:43.296Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-15T13:16:51.540

Modified: 2026-10-06T14:40:41.777

Link: CVE-2026-92018

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-15T12:33:38Z

Links: CVE-2026-92018 - Bugzilla