Plone through 5.2.4 allows remote authenticated managers to conduct SSRF attacks via an event ical URL, to read one line of a file.
{ "versions": [ { "introduced": "0" }, { "last_affected": "5.2.4" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33510.json"