Description
Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
Published: 2026-09-15
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 22 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Mon, 21 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV3_1

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


Thu, 17 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362

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

Type Values Removed Values Added
Weaknesses CWE-368
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

threat_severity

Moderate


Wed, 16 Sep 2026 04:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362

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

Type Values Removed Values Added
Description Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156. Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
References

Tue, 15 Sep 2026 14:30:00 +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 due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156.
Title Sandbox escape due to race condition in the XPConnect component
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-09-21T17:40:00.439Z

Reserved: 2026-09-15T12:34:10.939Z

Link: CVE-2026-92050

cve-icon Vulnrichment

Updated: 2026-09-21T17:39:39.714Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-15T13:16:56.717

Modified: 2026-09-21T18:17:13.537

Link: CVE-2026-92050

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-15T12:34:11Z

Links: CVE-2026-92050 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-21T20:15:16Z

Weaknesses
  • CWE-362

    Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

  • CWE-368

    Context Switching Race Condition