Medium severity · published Aug 2, 2026
CVE-2026-18570
Keycloak-services: keycloak-services: full-scope-disabled client policy validation bypass via omitted fullscopeallowed
5.4
CVSS
0.3%
EPSS
No
On KEV
Description
A flaw was found in the full-scope-disabled client-policy executor within the keycloak-services component. This component is responsible for enforcing security policies during client registration and configuration in Red Hat Build of Keycloak. The issue occurs because the executor only validates the fullScopeAllowed field when it is explicitly provided in a request. By omitting this field, a delegated user can bypass the policy, resulting in a client created with full scope access. This allows the client to obtain tokens with unauthorized role mappings.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat build of Keycloak 26.6 · Red Hat
All versions, or not specified · source: vendor
BO
Build OF Keycloak · Redhat
All versions, or not specified · source: NVD
Affected product
RH
Red Hat build of Keycloak 26.6
Red Hat
More from Red Hat build of Keycloak 26.6
9.8
CVE-2026-16442
Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
9.1
CVE-2026-18963
Keycloak-services: keycloak-services: unauthenticated account takeover via reset-credentials flow bypass
9.1
CVE-2026-16443
Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation
8.8
CVE-2026-15572
Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
8.8
CVE-2026-9704
Keycloak: keycloak: privilege escalation due to oversized subject_token jwt