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CVE-2026-4636— Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.

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，该漏洞源于具有uma_protection角色的已验证用户可绕过UMA策略验证，可能导致攻击者在策略创建请求中包含其他用户拥有的资源标识符，从而获得对受害者拥有资源的未经授权权限。

CVSS 8.1 · High EPSS 0.48% · P39

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-2026-4636

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the URL path specifies an attacker-owned resource. Consequently, the attacker gains unauthorized permissions to victim-owned resources, enabling them to obtain a Requesting Party Token (RPT) and access sensitive information or perform unauthorized actions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序：在解析与净化处理之前进行授权
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，该漏洞源于具有uma_protection角色的已验证用户可绕过UMA策略验证，可能导致攻击者在策略创建请求中包含其他用户拥有的资源标识符，从而获得对受害者拥有资源的未经授权权限。
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-2026-4636

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III. Intelligence Information for CVE-2026-4636

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Vendor Advisories for CVE-2026-4636 (6)

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

CVE-2026-4634 7.5 HIGH Keycloak: keycloak: denial of service via excessive processing of openid connect scope par
CVE-2026-4282 7.4 HIGH Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseob
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-551

V. Comments for CVE-2026-4636

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