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CVE-2026-4366— Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak

CVSS 5.8 · Medium EPSS 0.03% · P10
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I. Basic Information for CVE-2026-4366

Vulnerability Information
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Vulnerability Title
Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Keycloak 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在代码问题漏洞，该漏洞源于处理客户端配置请求时不当遵循HTTP重定向，可能导致信息泄露和内部网络映射。
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

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat JBoss Enterprise Application Platform 8-cpe:/a:redhat:jboss_enterprise_application_platform:8
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed Hat Single Sign-On 7-cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-4366

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III. Intelligence Information for CVE-2026-4366

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Same Patch Batch · Red Hat · 2026-03-18 · 4 CVEs total

CVE-2026-26038.1 HIGHKeycloak: keycloak: unauthorized authentication via disabled saml identity provider
CVE-2026-20927.7 HIGHKeycloak-services: keycloak: unauthorized access via improper validation of encrypted saml
CVE-2026-25755.3 MEDIUMKeycloak: keycloak: denial of service due to excessive samlrequest decompression

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-918

V. Comments for CVE-2026-4366

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