A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users external storage configuration when not already configured yet.
{ "versions": [ { "introduced": "0" }, { "fixed": "20.0.6" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-22877.json"
[ { "events": [ { "introduced": "0" }, { "last_affected": "34" } ] } ]