{"cve":"CVE-2023-0091","nvd":{"published":"2023-01-13T06:15:11.930","modified":"2026-06-17T05:24:45.587","status":"Modified","description":"A flaw was found in Keycloak, where it did not properly check client tokens for possible revocation in its client credential flow. This flaw allows an attacker to access or modify potentially sensitive information.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","score":3.8},"cwes":["CWE-863"],"references":["https://access.redhat.com/security/cve/CVE-2023-0091","https://access.redhat.com/security/cve/CVE-2023-0091"],"products":["redhat:keycloak"],"source":"nvd","synced_at":"2026-10-19T21:37:34.931465858+00:00"},"epss":{"cve":"CVE-2023-0091","score":0.00479,"percentile":0.41394,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-v436-q368-hvgg","url":"https://osv.dev/vulnerability/GHSA-v436-q368-hvgg","summary":"Keycloak has lack of validation of access token on client registrations endpoint","modified":"2023-11-08T04:11:05.394649Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-core","purl":"pkg:maven/org.keycloak/keycloak-core","ranges":["<20.0.3"],"fixed":["20.0.3"]}]}],"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."]}