--- id: CVE-2024-4540 title: A flaw was found in Keycloak in OAuth 2.0 Pushed Authorization Requests (PAR) summary: >- A flaw was found in Keycloak in OAuth 2.0 Pushed Authorization Requests (PAR). Client-provided parameters were found to be included in plain text in the KC_RESTART cookie returned by the authorization server's HTTP response to a `request… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N' cwe: - CWE-312 published: '2024-06-03' updated: '2026-10-09' sourceUpdated: '2026-10-09T17:16:39.943' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-4540' references: - url: 'https://access.redhat.com/errata/RHSA-2024:3566' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3567' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3568' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3570' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3572' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3573' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3574' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3575' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3576' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2024-4540' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2279303' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:3566' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3567' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3568' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3570' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3572' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3573' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3574' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3575' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:3576' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/security/cve/CVE-2024-4540' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2279303' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-4540.json - url: 'https://www.cve.org/CVERecord?id=CVE-2024-4540' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-4540' tags: - nvd - csaf - vex - red-hat - cve.org epss: 0.00551 epssPercentile: 0.45893 ingestedAt: '2026-10-09T18:07:39.401Z' vendor: Red Hat product: Red Hat build of Keycloak 22 affected: - 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 - build_of_keycloak 24 - single_sign_on_7_6_for_rhel 9 - build_of_keycloak - single_sign_on 7 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 - build_of_keycloak 24 - single_sign_on_7_6_for_rhel 9 - build_of_keycloak - single_sign_on 7 ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2024-06-03T16:13:25.347543Z' --- ## Overview A flaw was found in Keycloak in OAuth 2.0 Pushed Authorization Requests (PAR). Client-provided parameters were found to be included in plain text in the KC_RESTART cookie returned by the authorization server's HTTP response to a `request_uri` authorization request, possibly leading to an information disclosure vulnerability. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2024:3566** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 7 Server · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3566) - **RHSA-2024:3570** · Red Hat · fixed in: Middleware Containers for OpenShift · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3570) - **RHSA-2024:3567** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 8 · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3567) - **RHSA-2024:3573** · Red Hat · fixed in: Red Hat build of Keycloak 22 · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3573) - **RHSA-2024:3576** · Red Hat · fixed in: Red Hat build of Keycloak 24 · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3576) - **RHSA-2024:3568** · Red Hat · fixed in: Red Hat Single Sign-On 7.6 for RHEL 9 · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3568) - **RHSA-2024:3574** · Red Hat · fixed in: Red Hat Build of Keycloak · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3574) - **RHSA-2024:3572** · Red Hat · fixed in: Red Hat Single Sign-On 7 · released 2024-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2024:3572)