An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "formpost.jwt". It is observed that changing the responsemode parameter in the original proof of concept from "formpost" to "formpost.jwt" can bypass the security patch implemented to address CVE-2023-6134.
{ "nvd_published_at": null, "cwe_ids": [ "CWE-601" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2024-01-23T14:43:50Z" }