Missing Authorization in Keycloak - CVE-2026-18570
Published: August 2, 2026 / Updated: September 5, 2026
Vulnerability identifier: #VU146981
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-18570
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to obtain tokens with unauthorized role mappings.
The vulnerability exists due to missing authorization in the full-scope-disabled client-policy executor within the keycloak-services component when processing client registration or configuration requests that omit the fullScopeAllowed field. A remote user can omit the fullScopeAllowed field when creating a client to obtain tokens with unauthorized role mappings.
Affected software
Keycloak
How to mitigate CVE-2026-18570
Install security update from vendor's website.
Keycloak - update to 26.7.3