A cross-origin iframe referencing an XSLT document would inherit the parent domain's permissions (such as microphone or camera access). This vulnerability affects Thunderbird < 102.2, Thunderbird < 91.13, Firefox ESR < 91.13, Firefox ESR < 102.2, and Firefox < 104. A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue of a cross-origin iframe referencing an XSLT document inheriting the parent domain's permissions (such as microphone or camera access).
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