{"cve":"CVE-2020-27838","nvd":{"published":"2021-03-08T22:15:13.423","modified":"2026-06-17T03:09:42.887","status":"Modified","description":"A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","score":6.5},"cwes":["CWE-287"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1906797","https://bugzilla.redhat.com/show_bug.cgi?id=1906797"],"products":["redhat:keycloak","redhat:single_sign-on"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2020-27838","score":0.17866,"percentile":0.97175,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-pcv5-m2wh-66j3","url":"https://osv.dev/vulnerability/GHSA-pcv5-m2wh-66j3","summary":"Keycloak discloses information without authentication","modified":"2024-04-22T23:26:36.742448Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-core","purl":"pkg:maven/org.keycloak/keycloak-core","ranges":["<13.0.0"],"fixed":["13.0.0"]}]}],"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."]}