CVE-2026-4687

HIGH SEVERITY

CVSS Score & Metrics

Base Score

8.6 / 10

Vector String

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

Vulnerability Description

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

Vulnerability Details

Published Date

March 24, 2026

Last Modified

March 25, 2026

CWE ID

CWE-754

Source

NVD

Vendor

mozilla

Product

firefox

External References

https://bugzilla.mozilla.org/show_bug.cgi?id=2016368
https://www.mozilla.org/security/advisories/mfsa2026-20/
https://www.mozilla.org/security/advisories/mfsa2026-21/
https://www.mozilla.org/security/advisories/mfsa2026-22/

CVE-2026-4687

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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