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CVE-2026-4282

HighPublished

Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw

Published: Apr 2, 2026
Updated: Jul 15, 2026
Assigning CNA: redhat
Evidence observed: Sep 18, 2026

Primary CVSS

7.4/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 36.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an unauthenticated attacker to forge authorization codes. Successful exploitation can lead to the creation of admin-capable access tokens, resulting in privilege escalation.

Sources

CVE-2026-4282-ScannerScanner
Non-intrusive version-based vulnerability scanner for CVE-2026-4282 (Keycloak SingleUseObjectProvider isolation flaw enabling authorization code forgery & privilege escalation)

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