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

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于SingleUseObjectProvider缺乏适当的类型和命名空间隔离，可能导致未经验证的攻击者伪造授权代码，创建具有管理员能力的访问令牌，造成权限提升。

CVSS 7.4 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.2 26.2.15-1< * unaffected
26.2-18< * unaffected
26.2-18< * unaffected
Red Hat Red Hat build of Keycloak 26.2.15 any unaffected
Red Hat Red Hat build of Keycloak 26.4 26.4.11-1< * unaffected
26.4-14< * unaffected
26.4-14< * unaffected
Red Hat Red Hat build of Keycloak 26.4.11 any unaffected
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I. Basic Information for CVE-2026-4282

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的划分
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于SingleUseObjectProvider缺乏适当的类型和命名空间隔离，可能导致未经验证的攻击者伪造授权代码，创建具有管理员能力的访问令牌，造成权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.2 26.2.15-1 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-18 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-18 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2.15 - cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.11-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.11 - cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-4282

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III. Intelligence Information for CVE-2026-4282

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Vendor Advisories for CVE-2026-4282 (6)

Same Patch Batch · Red Hat · 2026-04-02 · 5 CVEs total

CVE-2026-4636 8.1 HIGH Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized acce
CVE-2026-4634 7.5 HIGH Keycloak: keycloak: denial of service via excessive processing of openid connect scope par
CVE-2026-3872 7.3 HIGH Keycloak: keycloak: information disclosure due to redirect_uri validation bypass
CVE-2026-4325 5.3 MEDIUM Keycloak: keycloak: replay of action tokens via improper handling of single-use entries

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.2
Same vendor: Red Hat
Same weakness: CWE-653

V. Comments for CVE-2026-4282

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