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CVE-2026-94215— Keycloak-services: keycloak-services: cross-realm client read/write via request-level cache missing realm ownership check

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.

在开源身份和访问管理解决方案 Keycloak 的管理 REST API 中发现了一个漏洞。该问题产生于 API 使用按请求内存缓存来通过唯一标识符解析客户端时，未验证该客户端是否属于请求路径中指定的 Realm（领域）。这使得拥有有限权限的管理员能够通过其控制的 Realm 访问 Master Realm，从而读取或修改敏感客户端配置。成功利用该漏洞可能导致客户端凭证泄露，或将管理员登录尝试重定向到恶意站点。

CVSS 5.5 · Medium
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I. Basic Information for CVE-2026-94215

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: cross-realm client read/write via request-level cache missing realm ownership check
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management solution. The issue occurs because the API uses a per-request in-memory cache to resolve clients by their unique identifier without verifying if the client belongs to the realm specified in the request path. This allows an administrator with limited privileges to read or modify sensitive client configurations in the master realm by accessing them through a realm they control. Successful exploitation could lead to the exposure of client credentials or the redirection of administrative login attempts to malicious sites.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

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 Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-94215

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III. Intelligence Information for CVE-2026-94215

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Other References for CVE-2026-94215 (2)

Same Patch Batch · Red Hat · 2026-09-21 · 4 CVEs total

CVE-2026-94213 4.9 MEDIUM Keycloak-services: keycloak-services: authorization services policy evaluation endpoint le
CVE-2026-94217 3.5 LOW Keycloak-services: keycloak-services: uma scope merge across resource owners via resource
CVE-2026-94218 3.1 LOW Keycloak-services: keycloak-services: 2fa setup enforcement bypass via authentication sess

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-94215

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