Authorization Bypass Through User-Controlled Key Affecting org.keycloak:keycloak-core package, versions [,26.7.1)
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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- published24 Aug 2026
- disclosed5 Aug 2026
- creditUnknown
Introduced: 5 Aug 2026
NewCVE-2026-16102 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-core to version 26.7.1 or higher.
Overview
org.keycloak:keycloak-core is an open source identity and access management solution.
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key validation in the user property mapper handling for ClientRegistrationAuth and related DCR token processing. An attacker with a standard user account and a limited Initial Access Token can register a client with a User Property mapper that writes into sensitive internal claims such as realm_access or resource_access, forging administrative roles in the resulting access token. That forged token can then be used to impersonate privileged access, take over other clients, and expose confidential client secrets or realm administration capabilities.