Service workers can use redirection to avoid the tainting of cross-origin resources in some instances, allowing a malicious site to read responses which are supposed to be opaque. This vulnerability affects Firefox < 61.
[
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "61",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]