--- id: CVE-2023-6134 title: >- A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token summary: >- A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This issue could allow an attacker to submit a specially crafted request leading to cross-site scripting (X… 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-79 vendor: redhat product: single_sign-on affected: - single_sign-on < 7.6 - keycloak < 22.0.7 - openshift_container_platform = 4.11 - openshift_container_platform = 4.12 - openshift_container_platform_for_power = 4.9 - openshift_container_platform_for_power = 4.10 - openshift_container_platform_ibm_z_systems = 4.9 - openshift_container_platform_ibm_z_systems = 4.10 - single_sign-on patched: - single_sign-on 7.6 - keycloak 22.0.7 published: '2023-12-14' updated: '2026-09-22' sourceUpdated: '2026-09-22T04:17:53.083' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-6134' references: - url: 'https://access.redhat.com/errata/RHSA-2023:7854' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7855' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7856' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7857' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7858' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7860' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7861' 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-2023-6134' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2249673' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:7854' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7855' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7856' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7857' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7858' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7860' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:7861' 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-2023-6134' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2249673' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-6134.json - url: 'https://www.cve.org/CVERecord?id=CVE-2023-6134' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-6134' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.01318 epssPercentile: 0.69579 ingestedAt: '2026-09-22T03:57:48.897Z' --- ## Overview A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This issue could allow an attacker to submit a specially crafted request leading to cross-site scripting (XSS) or further attacks. This flaw is the result of an incomplete fix for CVE-2020-10748. ## Affected - `single_sign-on < 7.6` - `keycloak < 22.0.7` - `openshift_container_platform = 4.11` - `openshift_container_platform = 4.12` - `openshift_container_platform_for_power = 4.9` - `openshift_container_platform_for_power = 4.10` - `openshift_container_platform_ibm_z_systems = 4.9` - `openshift_container_platform_ibm_z_systems = 4.10` - `single_sign-on` ## Remediation Upgrade past the affected range: - `single_sign-on 7.6` - `keycloak 22.0.7` ## Vendor advisories - **RHSA-2023:7854** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 7 Server · released 2023-12-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:7854) - **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-2023:7857** · Red Hat · fixed in: Middleware Containers for OpenShift · released 2023-12-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:7857) - **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-2023:7856** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 8 · released 2023-12-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:7856) - **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-2023:7861** · Red Hat · fixed in: Red Hat build of Keycloak 22 · released 2023-12-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:7861) - **RHSA-2023:7855** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 9 · released 2023-12-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:7855) - **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-2023:7860** · Red Hat · fixed in: Red Hat build of Keycloak 22.0.7 · released 2023-12-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:7860)