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CVE-2026-18207— Keycloak-services: keycloak-services: client policy source-group condition bypass via duplicate group name matching

Quick assessment

Affected
Red Hat Red Hat Build of Keycloak
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组织开源的一种身份和访问管理解决方案。 Keycloak存在授权问题漏洞，该漏洞源于客户端策略执行机制中，系统通过组名而不是唯一标识符检查组成员身份，可能导致具有客户端管理权限的攻击者绕过安全策略，从而注册或更新客户端而不遵循安全强化配置。

CVSS 6.5 · Medium EPSS 0.31% · P22

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Build of Keycloak any affected
any affected
any affected
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-2026-18207

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: client policy source-group condition bypass via duplicate group name matching
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the client policy enforcement mechanism of Keycloak. The issue occurs when the system checks group membership by name instead of a unique identifier. An attacker with client management privileges could bypass security policies by joining a group with a matching name in a different part of the group hierarchy, potentially allowing them to register or update clients without following required security hardening profiles.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak组织开源的一种身份和访问管理解决方案。 Keycloak存在授权问题漏洞，该漏洞源于客户端策略执行机制中，系统通过组名而不是唯一标识符检查组成员身份，可能导致具有客户端管理权限的攻击者绕过安全策略，从而注册或更新客户端而不遵循安全强化配置。
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 - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
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-2026-18207

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III. Intelligence Information for CVE-2026-18207

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Vendor Advisories for CVE-2026-18207 (1)

Same Patch Batch · Red Hat · 2026-07-29 · 4 CVEs total

CVE-2026-18220 7.8 HIGH Binutils: binutils: out-of-bounds write in bfd dlx elf backend relocation processing
CVE-2026-18255 7.2 HIGH Quay: quay: global read-only superuser can view robot account tokens
CVE-2026-18201 5.5 MEDIUM Keycloak-services: keycloak-services: generic identity-provider creation can bind brokers

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-285

V. Comments for CVE-2026-18207

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