Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
History

Fri, 22 May 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-403
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 20 May 2026 15:15:00 +0000

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

Tue, 19 May 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200

Tue, 19 May 2026 17:45:00 +0000

Type Values Removed Values Added
Description Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11. Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
References

Tue, 19 May 2026 15:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200

Tue, 19 May 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-668
CWE-693
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'}

ssvc

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


Tue, 19 May 2026 15:15:00 +0000

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

Tue, 19 May 2026 13:45:00 +0000

Type Values Removed Values Added
Description Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.
Title Information disclosure, sandbox escape in the Security: Process Sandboxing component
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-05-19T17:10:50.174Z

Reserved: 2026-05-19T12:29:53.304Z

Link: CVE-2026-8958

cve-icon Vulnrichment

Updated: 2026-05-19T15:04:50.040Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-19T14:16:52.170

Modified: 2026-05-20T15:01:41.923

Link: CVE-2026-8958

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-19T12:29:54Z

Links: CVE-2026-8958 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-22T02:15:06Z