When an “iframe” has a “sandbox” attribute and its content is specified using “srcdoc”, that content does not inherit the containing page’s Content Security Policy (CSP) as it should unless the sandbox attribute included “allow-same-origin”. This vulnerability affects Firefox < 55.
[
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "55",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]