CVE-2026-2603— Keycloak: keycloak: unauthorized authentication via disabled saml identity provider
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I. Basic Information for CVE-2026-2603
Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: unauthorized authentication via disabled saml identity provider
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
Keycloak 安全漏洞
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存在安全漏洞，该漏洞源于SAML端点未验证外部身份提供者状态，可能导致绕过安全控制并完成未经授权的身份验证。
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 26.2 | 26.2.14-1 ~ * | cpe:/a:redhat:build_keycloak:26.2::el9 | |
| Red Hat | Red Hat build of Keycloak 26.2 | 26.2-16 ~ * | cpe:/a:redhat:build_keycloak:26.2::el9 | |
| Red Hat | Red Hat build of Keycloak 26.2 | 26.2-16 ~ * | cpe:/a:redhat:build_keycloak:26.2::el9 | |
| Red Hat | Red Hat build of Keycloak 26.2.14 | - | cpe:/a:redhat:build_keycloak:26.2::el9 | |
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4.10-1 ~ * | cpe:/a:redhat:build_keycloak:26.4::el9 | |
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-12 ~ * | cpe:/a:redhat:build_keycloak:26.4::el9 | |
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-12 ~ * | cpe:/a:redhat:build_keycloak:26.4::el9 | |
| Red Hat | Red Hat build of Keycloak 26.4.10 | - | cpe:/a:redhat:build_keycloak:26.4::el9 |
II. Public POCs for CVE-2026-2603
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|---|
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Same Patch Batch · Red Hat · 2026-03-18 · 4 CVEs total
| CVE-2026-2092 | 7.7 HIGH | Keycloak-services: keycloak: unauthorized access via improper validation of encrypted saml |
| CVE-2026-4366 | 5.8 MEDIUM | Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in |
| CVE-2026-2575 | 5.3 MEDIUM | Keycloak: keycloak: denial of service due to excessive samlrequest decompression |
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V. Comments for CVE-2026-2603
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