--- id: CVE-2023-6927 title: A flaw was found in Keycloak summary: >- 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… severity: medium cvss: 4.6 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N' cwe: - CWE-601 vendor: redhat product: keycloak affected: - keycloak - single_sign-on = 7.0 published: '2023-12-18' updated: '2026-09-22' sourceUpdated: '2026-09-22T04:17:56.923' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-6927' references: - url: 'https://access.redhat.com/errata/RHSA-2024:0094' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0095' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0096' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0097' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0098' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0100' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0101' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0798' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0799' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0800' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0801' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0804' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2023-6927' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2255027' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0094' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0095' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0096' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0097' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0098' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0100' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0101' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0798' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0799' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0800' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0801' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0804' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/security/cve/CVE-2023-6927' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2255027' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-6927.json - url: 'https://www.cve.org/CVERecord?id=CVE-2023-6927' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-6927' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.01109 epssPercentile: 0.64463 ingestedAt: '2026-09-22T03:57:48.896Z' patched: - single_sign_on_7_6_for_rhel_7_server - middleware_containers_for_openshift - single_sign_on_7_6_for_rhel 8 - build_of_keycloak 22 - single_sign_on_7_6_for_rhel 9 - single_sign_on 7 - build_of_keycloak 22.0.8 - single_sign_on 7.6.6 --- ## Overview 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. ## Affected - `keycloak` - `single_sign-on = 7.0` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2024:0094** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 7 Server · released 2024-01-09 · [advisory](https://access.redhat.com/errata/RHSA-2024:0094) - **RHSA-2024:0798** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 7 Server · released 2024-02-13 · [advisory](https://access.redhat.com/errata/RHSA-2024:0798) - **RHSA-2024:0801** · Red Hat · fixed in: Middleware Containers for OpenShift · released 2024-02-13 · [advisory](https://access.redhat.com/errata/RHSA-2024:0801) - **RHSA-2024:0097** · Red Hat · fixed in: Middleware Containers for OpenShift · released 2024-01-09 · [advisory](https://access.redhat.com/errata/RHSA-2024:0097) - **RHSA-2024:0095** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 8 · released 2024-01-09 · [advisory](https://access.redhat.com/errata/RHSA-2024:0095) - **RHSA-2024:0799** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 8 · released 2024-02-13 · [advisory](https://access.redhat.com/errata/RHSA-2024:0799) - **RHSA-2024:0100** · Red Hat · fixed in: Red Hat build of Keycloak 22 · released 2024-01-09 · [advisory](https://access.redhat.com/errata/RHSA-2024:0100) - **RHSA-2024:0096** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 9 · released 2024-01-09 · [advisory](https://access.redhat.com/errata/RHSA-2024:0096) - **RHSA-2024:0800** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 9 · released 2024-02-13 · [advisory](https://access.redhat.com/errata/RHSA-2024:0800) - **RHSA-2024:0804** · Red Hat · fixed in: Red Hat Single Sign-On 7 · released 2024-02-13 · [advisory](https://access.redhat.com/errata/RHSA-2024:0804) - **RHSA-2024:0101** · Red Hat · fixed in: Red Hat build of Keycloak 22.0.8 · released 2024-01-09 · [advisory](https://access.redhat.com/errata/RHSA-2024:0101)