Vulnerability Description
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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | - |
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-18206Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2508292Issue TrackingVendor Advisory
FAQ
What is CVE-2026-18206?
CVE-2026-18206 is a vulnerability with a CVSS score of 3.7 (LOW). 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 *.exam...
How severe is CVE-2026-18206?
CVE-2026-18206 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-18206?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.