CVE-2026-42827.4HighCWE-653

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

Red Hat · Red Hat build of Keycloak 26.2

Vendor fix available · Affected: Red Hat build of Keycloak 26.2 · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.4%probability of exploitation in the next 30 days

38th percentile

050100

Higher than 38% of scored CVEs

7.4HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 products8

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Red Hat · Red Hat build of Keycloak 26.2Versions not stated
Red Hat · Red Hat build of Keycloak 26.2Versions not stated
Red Hat · Red Hat build of Keycloak 26.2Versions not stated
Red Hat · Red Hat build of Keycloak 26.2.15Versions not stated
Red Hat · Red Hat build of Keycloak 26.4Versions not stated
Red Hat · Red Hat build of Keycloak 26.4Versions not stated
Red Hat · Red Hat build of Keycloak 26.4Versions not stated
Red Hat · Red Hat build of Keycloak 26.4.11Versions not stated

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Improper Isolation or Compartmentalization · Access Control
Vendor: Red Hat
Published: April 2026
Band: Unlikely (under 1%), April 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-4282 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.