A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.
Advisories
Source ID Title
EUVD EUVD EUVD-2024-0318 A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.
Github GHSA Github GHSA GHSA-9vm7-v8wj-3fqw keycloak-core: open redirect via "form_post.jwt" JARM response mode
Fixes

Solution

No solution given by the vendor.


Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2025-10-09T23:59:58.241Z

Reserved: 2023-12-18T15:44:40.245Z

Link: CVE-2023-6927

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-12-18T23:15:10.027

Modified: 2024-11-21T08:44:51.110

Link: CVE-2023-6927

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-12-18T00:00:00Z

Links: CVE-2023-6927 - Bugzilla

cve-icon OpenCVE Enrichment

No data.