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Vulnerability · Published Apr 2, 2026 · Assigned by redhat

CVE-2026-4282Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw

High 7.4

In plain English

A high-severity security flaw in Red Hat build of Keycloak 26.2 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.4%top 62.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.keycloak:keycloak-services26.5.7GHSA-hj93-h7pg-fh6v

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat build of Keycloak 26.2 see references
Red Hat Red Hat build of Keycloak 26.2 see references
Red Hat Red Hat build of Keycloak 26.2 see references
Red Hat Red Hat build of Keycloak 26.2.15 see references
Red Hat Red Hat build of Keycloak 26.4 see references
Red Hat Red Hat build of Keycloak 26.4 see references
Red Hat Red Hat build of Keycloak 26.4 see references
Red Hat Red Hat build of Keycloak 26.4.11 see references

Weakness: CWE-653 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References