{"cve":"CVE-2020-27826","nvd":{"published":"2021-05-28T11:15:07.670","modified":"2026-06-17T03:09:41.610","status":"Modified","description":"A flaw was found in Keycloak before version 12.0.0 where it is possible to update the user's metadata attributes using Account REST API. This flaw allows an attacker to change its own NameID attribute to impersonate the admin user for any particular application.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","score":4.2},"cwes":["CWE-250"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1905089","https://bugzilla.redhat.com/show_bug.cgi?id=1905089"],"products":["redhat:keycloak","redhat:single_sign-on"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2020-27826","score":0.00572,"percentile":0.47288,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-m9cj-v55f-8x26","url":"https://osv.dev/vulnerability/GHSA-m9cj-v55f-8x26","summary":"Authentication Bypass in keycloak","modified":"2023-11-08T04:03:22.491073Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-core","purl":"pkg:maven/org.keycloak/keycloak-core","ranges":["<12.0.0"],"fixed":["12.0.0"]}]}],"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."]}