{"id":"CVE-2026-97846","title":"Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate","summary":"Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate. A flaw was discovered where the new Standard…","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-287"],"vendor":"Red Hat","product":"Red Hat Build of Keycloak","affected":["build_of_keycloak"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T07:16:57.147","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97846","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-97846","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540949","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97846.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97846"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97846"}],"tags":["nvd","csaf","vex","red-hat","cve.org"],"ingestedAt":"2026-09-25T07:01:12.116Z","slug":"CVE-2026-97846","body":"## Overview\n\nKeycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate. A flaw was discovered where the new Standard Token Exchange V2 feature does not check for this certificate. This allows an attacker with stolen client credentials to obtain a standard, unrestricted token that bypasses these security protections.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Build of Keycloak · no fix planned: Red Hat Build of Keycloak · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97846.json)","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":37.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}