A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using response_mode=form_post it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.
{
"github_reviewed_at": "2023-07-21T22:47:11Z",
"severity": "MODERATE",
"cwe_ids": [
"CWE-79"
],
"nvd_published_at": "2018-11-13T19:29:00Z",
"github_reviewed": true
}