Prior to version 10.9.0, the sharing/rest/content/features/analyze endpoint is always accessible to anonymous users, which could allow an unauthenticated attacker to induce Esri Portal for ArcGIS to read arbitrary URLs.
Add your gear to cvedb and we'll alert you only when esri ships something exploited.
Check my exposure →This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.