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

Quick assessment

Affected
Keycloak Keycloak
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。

CVSS 8.1 · High EPSS 0.56% · P47

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 7

VendorProduct Version RangeStatus
Keycloak Keycloak 26.5.0< 26.5.3 affected
Red Hat Red Hat JBoss Enterprise Application Platform 8 any unaffected
any unaffected
any unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any unaffected
any unaffected
any unaffected
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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: CVE Program / CVE List V5
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: 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
访问控制不恰当
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

Vendor Product Affected Versions CPE Subscribe
Keycloak Keycloak 26.5.0 ~ 26.5.3 -
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 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
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 JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red 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