Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw
Summary
| CVE | CVE-2026-4282 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-02 13:16:26 UTC |
| Updated | 2026-07-15 02:22:39 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.4 HIGH from ADP
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.004240000 probability, percentile 0.344510000 (date 2026-07-18)
Problem Types: CWE-653 | CWE-653 Improper Isolation or Compartmentalization
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | [email protected] | Secondary | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Redhat | Build Of Keycloak | - | All | All | All |
| Application | Redhat | Build Of Keycloak | 26.2 | All | All | All |
| Application | Redhat | Build Of Keycloak | 26.2.15 | All | All | All |
| Application | Redhat | Build Of Keycloak | 26.4 | All | All | All |
| Application | Redhat | Build Of Keycloak | 26.4.11 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2.15-1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-18 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-18 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2.15 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4.11-1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-14 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-14 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4.11 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2.15-1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-18 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-18 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2.15 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4.11-1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-14 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-14 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4.11 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4282.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:6477 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Vendor Advisory |
| access.redhat.com/errata/RHSA-2026:6475 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Vendor Advisory |
| access.redhat.com/security/cve/CVE-2026-4282 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Vendor Advisory |
| access.redhat.com/errata/RHSA-2026:6478 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Vendor Advisory |
| access.redhat.com/errata/RHSA-2026:6476 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Vendor Advisory |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | Issue Tracking, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Red Hat would like to thank chungkn (OneMount Group) for reporting this issue. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-03-16T15:53:57.767Z | Reported to Red Hat. |
| CNA | 2026-04-02T12:30:00.000Z | Made public. |
| ADP | 2026-03-16T15:53:57.767Z | Reported to Red Hat. |
| ADP | 2026-04-02T12:30:00.000Z | Made public. |
Solutions
ADP: RHSA-2026:6476: Red Hat build of Keycloak 26.2
ADP: RHSA-2026:6478: Red Hat build of Keycloak 26.4
ADP: RHSA-2026:6475: Red Hat build of Keycloak 26.2.15
ADP: RHSA-2026:6477: Red Hat build of Keycloak 26.4.11
Workarounds
CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
There are currently no legacy QID mappings associated with this CVE.