Plone before 5.2.3 allows XXE attacks via a feature that is protected by an unapplied permission of plone.schemaeditor.ManageSchemata (therefore, only available to the Manager role).
{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "5.2.3"
}
],
"source": "CPE_RANGE",
"cpe": "cpe:2.3:a:plone:plone:*:*:*:*:*:*:*:*"
}