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CVE-2026-16442— Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction

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存在输入验证错误漏洞，该漏洞源于SAML broker组件的IdP-initiated Single Sign-On端点未能检查provider是否仅限于账户关联，可能导致攻击者控制链接的上游身份绕过登录限制并获得本地用户账户的完全访问权限。

CVSS 7.4 · High EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 14

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
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
any unaffected
any unaffected
Red Hat Red Hat Data Grid 8 any unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any unaffected
Red Hat Red Hat Single Sign-On 7 any unaffected
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I. Basic Information for CVE-2026-16442

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.
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
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 输入验证错误漏洞
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存在输入验证错误漏洞，该漏洞源于SAML broker组件的IdP-initiated Single Sign-On端点未能检查provider是否仅限于账户关联，可能导致攻击者控制链接的上游身份绕过登录限制并获得本地用户账户的完全访问权限。
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 26.4.14 - 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
Red Hat Red Hat build of Keycloak 26.6.5 - 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
Red Hat Red Hat Data Grid 8 - cpe:/a:redhat:jboss_data_grid:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-16442

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III. Intelligence Information for CVE-2026-16442

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Vendor Advisories for CVE-2026-16442 (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-2026-15572 8.8 HIGH Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows p
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-2026-16100 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-346

V. Comments for CVE-2026-16442

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