An issue existed in the handling of S-MIME certificates. This issue was addressed with improved validation of S-MIME certificates. This issue is fixed in macOS Mojave 10.14.4, Security Update 2019-002 High Sierra, Security Update 2019-002 Sierra. Processing a maliciously crafted mail message may lead to S/MIME signature spoofing.
[
{
"product": "macOS",
"vendor": "Apple",
"versions": [
{
"lessThan": "10.14",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]