CVE-2026-4687

HighCVSS 8.6/10Last modified Jul 15, 2026

Description

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Metrics

CVSS 3.1 8.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weakness enumeration

CWE-754 CWE-120 CWE-501

Affected software

No affected versions have been published.

Timeline

Published: Mar 24, 2026
Last modified: Jul 15, 2026
NVD status: Modified

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