{"cve":"CVE-2023-2422","nvd":{"published":"2023-10-04T11:15:10.157","modified":"2026-06-17T05:52:33.157","status":"Modified","description":"A flaw was found in Keycloak. A Keycloak server configured to support mTLS authentication for OAuth/OpenID clients does not properly verify the client certificate chain. A client that possesses a proper certificate can authorize itself as any other client, therefore, access data that belongs to other clients.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","score":7.1},"cwes":["CWE-295"],"references":["https://access.redhat.com/errata/RHSA-2023:3883","https://access.redhat.com/errata/RHSA-2023:3884","https://access.redhat.com/errata/RHSA-2023:3885","https://access.redhat.com/errata/RHSA-2023:3888","https://access.redhat.com/errata/RHSA-2023:3892"],"products":["redhat:keycloak","redhat:openshift_container_platform","redhat:single_sign-on"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-2422","score":0.00522,"percentile":0.44324,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3qh5-qqj2-c78f","url":"https://osv.dev/vulnerability/GHSA-3qh5-qqj2-c78f","summary":"Keycloak vulnerable to Improper Client Certificate Validation for OAuth/OpenID clients","modified":"2024-02-16T08:22:30.918600Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","purl":"pkg:maven/org.keycloak/keycloak-services","ranges":["<21.1.2"],"fixed":["21.1.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}