Vulnerability Details CVE-2026-18206
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 10.1%
CVSS Severity
CVSS v3 Score 3.7
References
Products affected by CVE-2026-18206
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cpe:2.3:a:redhat:build_of_keycloak:-