This issue was addressed by enabling hardened runtime. This issue is fixed in iMovie 10.2.4. Entitlements and privacy permissions granted to this app may be used by a malicious app.
[
{
"product": "iMovie",
"vendor": "Apple",
"versions": [
{
"lessThan": "10.2",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]