Medium [CVE-2026-12388] Privilege escalation to realm administrator via improper authorization in identity provider mapper
This medium-severity Red Hat Linux advisory covers CVE-2026-12388 affecting Red Hat Build of Keycloak.
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Summary
A flaw was found in the Identity Provider (IdP) mapper component of Keycloak, which is used to manage how user information from external services is mapped to Keycloak users.
An administrator with limited permissions to manage identity providers can exploit this flaw by creating a "Hardcoded Role" mapper that assigns high-level administrative roles (like realm-admin) to themselves or others. This allows a restricted administrator to bypass security checks and gain full control over the entire realm.
The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires the attacker to already possess high-level administrative privileges (manage-identity-providers). Successful exploitation allows an attacker to escalate their privileges to realm-admin, granting them full control over the Keycloak realm.
The vulnerability's root cause is a failure to enforce proper authorization checks (specifically requireMapRole) within the Identity Provider mapper endpoint. Weakness: CWE-266.
Affected Red Hat products: Red Hat Build of Keycloak. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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