HarborGuard / CVE
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CRITICALCVE-2026-4687Published Modified CNA mozilla

CVE-2026-4687: Sandbox escape due to incorrect boundary conditions in the Telemetry component

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 v3.1
9.6
Severity
CRITICAL
Fixed in
115.34
Affected Products
2

Fix available

115.34140.9149
Affected packages
  • Mozilla / Firefox
    Fixed in 115.34, 140.9, 149
  • Mozilla / Thunderbird
    Fixed in 140.9, 149
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References