Ghost is a Node.js content management system. From 5.18.0 until 6.21.1, a discrepancy in responses from the members signin endpoints made it possible for an unauthenticated attacker to determine whether a given email address belongs to a registered member of a Ghost site. This vulnerability is fixed in 6.21.1.
{
"cpes": [
"cpe:2.3:a:ghost:ghost:*:*:*:*:*:node.js:*:*"
],
"severity": "Medium"
}