The WP Opt-in WordPress plugin through 1.4.1 is vulnerable to CSRF which allows changed plugin settings and can be used for sending spam emails.
[
{
"product": "WP Opt-in",
"vendor": "Unknown",
"versions": [
{
"lessThanOrEqual": "1.4.1",
"status": "affected",
"version": "1.4.1",
"versionType": "custom"
}
]
}
]