A consistency issue was addressed with improved state handling. This issue is fixed in iOS 12.2. A website may be able to access the microphone without the microphone use indicator being shown.
[
{
"product": "iOS",
"vendor": "Apple",
"versions": [
{
"lessThan": "iOS 12.2",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]