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Vulnerabilities CVE-2026-18203

CVE-2026-18203

Medium
Open
TLP:CLEAR

Keycloak-services: keycloak-services: group policy extendchildren matches sibling group path prefixes

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Description

A flaw was found in the group policy evaluation logic of Keycloak, an identity and access management solution. When a group policy is set to extend permissions to child groups, the system incorrectly uses a simple text-based prefix check to verify group membership. This allows a user who belongs to a different group with a similar starting name to bypass security checks and gain unauthorized access to administrative functions or protected resources.

Details

CVSS Score
6.5
EPSS Score
0.18%

8th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Confidence
90%
Published
Jul 31, 2026
Last Modified
Jul 31, 2026
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