Description (CNA)
A flaw was found in the keycloak-services component of Keycloak, which provides identity and access management services. The issue occurs when a realm administrator uses a wildcard domain (like *.example.com) to restrict which hosts can register or update clients. Due to improper validation, the system accepts any hostname that ends with the specified domain suffix, even if it is not a legitimate subdomain. An attacker who can control the reverse DNS of their connection can bypass these host-based restrictions, potentially allowing unauthorized client modifications.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Red Hat / Red Hat Build of Keycloak | affected |
| Red Hat / Red Hat Build of Keycloak | affected |
| Red Hat / Red Hat Build of Keycloak | affected |
| Red Hat / Red Hat Data Grid 8 | unaffected |
| Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack | unaffected |
| Red Hat / Red Hat Single Sign-On 7 | unaffected |
CWE
CWE-20
References
- https://access.redhat.com/security/cve/CVE-2026-18206
- https://bugzilla.redhat.com/show_bug.cgi?id=2508292
ADP enrichment
No English description supplied.
No references supplied.