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CVE-2026-1609— Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users

CVSS 8.1 · High EPSS 0.51% · P40

Possible ATT&CK Techniques 1AI

T1199 · Trusted Relationship

Affected Version Matrix 7

VendorProductVersion RangeStatus
KeycloakKeycloak26.5.0< 26.5.3affected
Red HatRed Hat JBoss Enterprise Application Platform 8anyunaffected
anyunaffected
anyunaffected
Red HatRed Hat JBoss Enterprise Application Platform Expansion Packanyunaffected
anyunaffected
anyunaffected
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I. Basic Information for CVE-2026-1609

Vulnerability Information
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Vulnerability Title
Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.
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
访问控制不恰当
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，该漏洞源于启用JWT授权授予预览功能且用户帐户被禁用时，Keycloak在处理JWT授权授予期间未验证用户的禁用状态，可能导致低权限远程攻击者使用外部身份提供商的有效断言令牌为禁用用户获取JWT。
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
KeycloakKeycloak 26.5.0 ~ 26.5.3 -
Red HatRed Hat JBoss Enterprise Application Platform 8-cpe:/a:redhat:jboss_enterprise_application_platform:8
Red HatRed Hat JBoss Enterprise Application Platform 8-cpe:/a:redhat:jboss_enterprise_application_platform:8
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 JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp

II. Public POCs for CVE-2026-1609

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III. Intelligence Information for CVE-2026-1609

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Vendor Advisories for CVE-2026-1609 (3)

Vendor Pages for CVE-2026-1609 (1)

IV. Related Vulnerabilities

Same product: Keycloak
Same vendor: Keycloak
Same weakness: CWE-284

V. Comments for CVE-2026-1609

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