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CVE-2026-2603— Keycloak: keycloak: unauthorized authentication via disabled saml identity provider

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.2
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。

CVSS 8.1 · High EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.2 26.2.14-1< * unaffected
26.2-16< * unaffected
26.2-16< * unaffected
Red Hat Red Hat build of Keycloak 26.2.14 any unaffected
Red Hat Red Hat build of Keycloak 26.4 26.4.10-1< * unaffected
26.4-12< * unaffected
26.4-12< * unaffected
Red Hat Red Hat build of Keycloak 26.4.10 any unaffected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
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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III. Intelligence Information for CVE-2026-2603

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Vendor Advisories for CVE-2026-2603 (5)

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

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.2
Same vendor: Red Hat
Same weakness: CWE-306

V. Comments for CVE-2026-2603

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