{"cve":"CVE-2026-9796","nvd":{"published":"2026-05-28T05:16:41.153","modified":"2026-10-26T12:10:00.130","status":"Modified","description":"A flaw was found in Keycloak. An authenticated administrator with the `manage-clients` role can exploit a Time-of-check to time-of-use (TOCTOU) vulnerability in the name-based admin role checks. This allows the attacker to escalate their privileges to `realm-admin` for all users within the realm, granting them extensive control over the system. The composite role relationship persists even after the attacker's own permissions are revoked and across system reboots.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","score":6.5},"cwes":["CWE-367"],"references":["https://access.redhat.com/errata/RHSA-2026:56523","https://access.redhat.com/errata/RHSA-2026:56524","https://access.redhat.com/security/cve/CVE-2026-9796","https://bugzilla.redhat.com/show_bug.cgi?id=2482464"],"products":["redhat:build_of_keycloak"],"source":"nvd","synced_at":"2026-10-26T12:35:18.182177120+00:00"},"epss":{"cve":"CVE-2026-9796","score":0.00219,"percentile":0.12263,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-pq65-77rc-7r8c","url":"https://osv.dev/vulnerability/GHSA-pq65-77rc-7r8c","summary":"Keycloak has a Time-of-check Time-of-use (TOCTOU) Race Condition","modified":"2026-08-19T00:45:06.924619010Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-server","purl":"pkg:maven/org.keycloak/keycloak-server","ranges":["<26.6.4"],"fixed":["26.6.4"]}]}],"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."]}