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.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HMozilla Firefox
APPMozilla< 96.0Mozilla Firefox Esr
APPMozilla< 91.5Mozilla Thunderbird
APPMozilla< 91.5
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CHECK WITH VENDOR
No clear patch data available. Check vendor references.
References
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