Incorrect Authorization Affecting org.keycloak:keycloak-authz-policy-common package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGKEYCLOAK-18752113
- published13 Aug 2026
- disclosed28 Jul 2026
- creditPaul Bottinelli
Introduced: 28 Jul 2026
NewCVE-2026-18203 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
org.keycloak:keycloak-authz-policy-common is a KeyCloak AuthZ: Common Policy Providers
Affected versions of this package are vulnerable to Incorrect Authorization in GroupPolicyProvider in the authorization policy provider. An attacker can bypass extendChildren group-based access checks by joining a different group whose path shares the same text prefix as the protected group, causing unauthorized access to administrative functions or protected resources. The flaw affects authorization decisions for group policies that extend permissions to child groups, where a raw prefix match can treat a sibling group as a valid member of the protected subtree. This lets a user satisfy a policy without belonging to the intended group hierarchy, breaking access control for affected realms and resources.