CVE-2026-4282
Keycloak: Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw
7.4
HIGH
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-4282
To remediate CVE-2026-4282, upgrade the affected package to a fixed version below.
- —upgrade to 26.5.7 or later
Is CVE-2026-4282 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 26.5.7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |