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High · 7.4 Public exploit CVE-2026-4282 BIT-keycloak-2026-4282EUVD-2026-18208GHSA-hj93-h7pg-fh6v

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

Published Apr 2, 2026 · Updated Jul 15, 2026 · Assigned by redhat

Vendor: Red Hat Product: Red Hat build of Keycloak 26.2 Product: Red Hat build of Keycloak 26.2.15 Product: Red Hat build of Keycloak 26.4 Product: Red Hat build of Keycloak 26.4.11 Package: keycloak-26.4-iamguarded-compat Package: keycloak-26.5 Package: keycloak-26.5-iamguarded-compat Package: org.keycloak:keycloak-services Ecosystem: Maven Ecosystem: Wolfi

Description

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.

Affected products

VendorProductAffectedFixed
Red Hat Red Hat build of Keycloak 26.2 — —
Red Hat Red Hat build of Keycloak 26.2.15 — —
Red Hat Red Hat build of Keycloak 26.4 — —
Red Hat Red Hat build of Keycloak 26.4.11 — —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling keycloak-26.4-iamguarded-compat No fix yet —
Wolfi rolling keycloak-26.5 +1 26.5.7-r0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • hex0user/CVE-2026-4282-Scanner ★ 3 · Aug 9, 2026

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

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Maven org.keycloak:keycloak-services < 26.5.7 26.5.7 GHSA-hj93-h7pg-fh6v

Advisories 1

References