CVE-2026-4366— Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak
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。
Affected Version Matrix 9
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | any |
affected |
any |
affected | ||
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4.12-1< * |
unaffected |
26.4-17< * |
unaffected | ||
26.4-17< * |
unaffected | ||
| Red Hat | Red Hat build of Keycloak 26.4.12 | any |
unaffected |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 | any |
affected |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | any |
affected |
| Red Hat | Red Hat Single Sign-On 7 | any |
affected |
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4.12-1 ~ * |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-17 ~ * |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-17 ~ * |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| Red Hat | Red Hat build of Keycloak 26.4.12 | - |
cpe:/a:redhat:build_keycloak:26.4::el9
|
|
| 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 JBoss Enterprise Application Platform 8 | - |
cpe:/a:redhat:jboss_enterprise_application_platform: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-2026-4366
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-4366 (3)
-
🔗 RHSA-2026:19596 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:19597 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
Same Patch Batch · Red Hat · 2026-03-18 · 4 CVEs total
| CVE-2026-2603 | 8.1 HIGH | Keycloak: keycloak: unauthorized authentication via disabled saml identity provider |
| CVE-2026-2092 | 7.7 HIGH | Keycloak-services: keycloak: unauthorized access via improper validation of encrypted saml |
| CVE-2026-2575 | 5.3 MEDIUM | Keycloak: keycloak: denial of service due to excessive samlrequest decompression |
IV. Related Vulnerabilities
Same product: Red Hat build of Keycloak 26.4
-
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CVE-2026-18212
Keycloak-services: keycloak-services: saml redirect deflate
Same vendor: Red Hat
-
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Same weakness: CWE-918
-
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UTMStack < 11.2.16 Server-Side Request Forgery via downloadP -
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UTMStack < 11.2.16 SSRF via IdentityProviderService -
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CVE-2026-103957
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