CVE-2021-4140

CriticalCVSS 10.0/10Last modified Jun 17, 2026

Description

It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-91

Affected software

No affected versions have been published.

Timeline

Published
Dec 22, 2022
Last modified
Jun 17, 2026
NVD status
Modified

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