VULNERABILITY INTELLIGENCE

CVE-2026-18206

CVSS score3.7 LOW
EPSS probability0.32%
CISA KEVNot currently listed
Published2026-07-31
Last modified2026-08-07
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Weakness classification

  • secalert@redhat.com: CWE-20

Primary references