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CVE-2026-4687criticalCWE-120CWE-501

Sandbox escape due to incorrect boundary conditions in the Telemetry component

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.6epss 0.5%
exploitation probability
0.5%top 56% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H