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CVE-2026-15572— Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.4
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 Keycloak是Keycloak组织开源的一款身份认证与权限管理软件。 Keycloak存在缓冲区错误漏洞，该漏洞源于动态客户端注册（DCR）安全策略管理中“Allowed Protocol Mapper Types”策略未能在客户端更新时重新验证映射器类型，可能导致具有客户端注册权限的攻击者注册恶意配置的允许映射器类型并交换为高权限映射器类型，从而获得Keycloak领域的完全管理访问权限。

CVSS 8.8 · High EPSS 0.65% · P49

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.4 26.4.14-1< * unaffected
26.4-22< * unaffected
26.4-22< * unaffected
Red Hat Red Hat build of Keycloak 26.4.14 any unaffected
Red Hat Red Hat build of Keycloak 26.6 26.6.5-1< * unaffected
26.6-11< * unaffected
26.6-11< * unaffected
Red Hat Red Hat build of Keycloak 26.6.5 any unaffected
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I. Basic Information for CVE-2026-15572

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mapper Types" policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type during a client update if the mapper's configuration remains unchanged. An attacker with client registration privileges can exploit this by first registering an allowed mapper type with a malicious configuration and then swapping it for a restricted, high-privilege mapper type (such as one that hardcodes administrative roles). This allows the attacker to gain full administrative access to the Keycloak realm.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak Keycloak是Keycloak组织开源的一款身份认证与权限管理软件。 Keycloak存在缓冲区错误漏洞，该漏洞源于动态客户端注册（DCR）安全策略管理中“Allowed Protocol Mapper Types”策略未能在客户端更新时重新验证映射器类型，可能导致具有客户端注册权限的攻击者注册恶意配置的允许映射器类型并交换为高权限映射器类型，从而获得Keycloak领域的完全管理访问权限。
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 26.4 26.4.14-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-22 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-22 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.14 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.6 26.6.5-1 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-11 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-11 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.5 - cpe:/a:redhat:build_keycloak:26.6::el9

II. Public POCs for CVE-2026-15572

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III. Intelligence Information for CVE-2026-15572

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Vendor Advisories for CVE-2026-15572 (6)

Same Patch Batch · Red Hat · 2026-08-05 · 11 CVEs total

CVE-2026-10059 9.1 CRITICAL Cluster-curator-controller: cluster-curator-controller: namespace admin can escalate to cl
CVE-2026-10090 9.0 CRITICAL Multicluster-operators-subscription: multicluster-operators-subscription: namespace edit u
CVE-2026-15573 8.1 HIGH Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching i
CVE-2026-16102 8.1 HIGH Keycloak-services: keycloak-services: default dcr policy allows role forgery via user prop
CVE-2026-16443 7.4 HIGH Keycloak-services: keycloak-services: saml broker metadata import disables response signat
CVE-2026-16442 7.4 HIGH Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only r
CVE-2026-16100 6.5 MEDIUM Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics v
CVE-2026-49331 6.5 MEDIUM Openshift/oauth-proxy: openshift/oauth-proxy: unauthenticated identity header injection on
CVE-2026-44605 5.5 MEDIUM Rpm: heap buffer overflow in ndb slot table parsing
CVE-2026-16071 5.4 MEDIUM Keycloak-services: keycloak-services: ldap entry-dn user search bypasses configured users

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-843

V. Comments for CVE-2026-15572

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