A flaw was found in Keycloak version 8.0.2 and 9.0.0, and was fixed in Keycloak version 9.0.1, where a malicious user registers as oneself. The attacker could then use the remove devices form to post different credential IDs and possibly remove MFA devices for other users.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10686
Reference (s):
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10686