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CVE-2026-18573— Keycloak-services: keycloak-services: client access-type policy condition bypass during client update

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.6
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keycloak-services组件对客户端状态评估不当，攻击者可通过先创建公共客户端再更新为较弱认证的机密客户端来绕过安全策略，导致不符合预期安全加固的客户端持久化。

CVSS 6.5 · Medium EPSS 0.48% · P39

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.6 26.6.7-3< * unaffected
26.6-20< * unaffected
26.6-20< * unaffected
Red Hat Red Hat build of Keycloak 26.6.7 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-2026-18573

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: client access-type policy condition bypass during client update
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the keycloak-services component of Keycloak, which is used for managing authentication and authorization flows. The issue occurs when a realm administrator configures client policies to enforce specific authentication requirements on confidential clients. Due to improper evaluation of the client state during an update operation, an attacker with client management permissions can bypass these security policies by first creating a public client and then updating it to a confidential client with weaker authentication. This can result in the persistence of clients that do not comply with the intended security hardening of the realm.
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
授权机制缺失
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keycloak-services组件对客户端状态评估不当，攻击者可通过先创建公共客户端再更新为较弱认证的机密客户端来绕过安全策略，导致不符合预期安全加固的客户端持久化。
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 26.6 26.6.7-3 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - 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-2026-18573

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III. Intelligence Information for CVE-2026-18573

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Vendor Advisories for CVE-2026-18573 (4)

Same Patch Batch · Red Hat · 2026-08-02 · 4 CVEs total

CVE-2026-18571 6.6 MEDIUM Keycloak-services: keycloak-services: fgap v2 group assignment bypass during user creation
CVE-2026-18572 6.5 MEDIUM Keycloak-services: keycloak-services: uma claim token can override authorization time-poli
CVE-2026-18570 5.4 MEDIUM Keycloak-services: keycloak-services: full-scope-disabled client policy validation bypass

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.6
Same vendor: Red Hat
Same weakness: CWE-862

V. Comments for CVE-2026-18573

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