High [CVE-2026-4282] Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw
This high-severity Red Hat Linux advisory covers CVE-2026-4282 affecting Red Hat build of Keycloak 26.2, Red Hat build of Keycloak 26.4.
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Summary
Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw. Red Hat rates this important (CVSS 7.4).
Weakness: CWE-653. Affected package(s): rhbk/keycloak-rhel9-operator:26.2, rhbk/keycloak-rhel9, rhbk/keycloak-operator-bundle:26.4.11, rhbk/keycloak-rhel9:26.2, rhbk/keycloak-operator-bundle:26.2.15, rhbk/keycloak-rhel9-operator:26.4.
Resolved in Red Hat advisory RHSA-2026:6478 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat build of Keycloak 26.2; Red Hat build of Keycloak 26.4.
- rhbk/keycloak-rhel9-operator:26.2-18
- rhbk/keycloak-rhel9
- rhbk/keycloak-operator-bundle:26.4.11-1
- rhbk/keycloak-rhel9:26.2-18
- rhbk/keycloak-operator-bundle:26.2.15-1
- rhbk/keycloak-rhel9-operator:26.4-14
- rhbk/keycloak-rhel9:26.4-14
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:6478
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:6478 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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