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.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "8.0.2"
},
{
"introduced": "0"
},
{
"last_affected": "9.0.0"
}
]
}