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CVE-2026-14781— Keycloak-services: keycloak-services: oidc email_verified claim incorrectly applied to userinfo email

Quick assessment

Affected
Red Hat Red Hat Build of 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组织开源的一种开源身份和访问管理解决方案。 Keycloak存在输入验证错误漏洞，该漏洞源于OIDC代理在同步email_verified声明时缺乏验证，可能导致将任意电子邮件地址标记为已验证，绕过基于电子邮件的安全控制或验证工作流，以及潜在的账户接管。

CVSS 4.8 · Medium EPSS 0.28% · P18

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Build of Keycloak any unaffected
any affected
any unaffected
Red Hat Red Hat Data Grid 8 any unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any unaffected
Red Hat Red Hat Single Sign-On 7 any unaffected
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I. Basic Information for CVE-2026-14781

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: oidc email_verified claim incorrectly applied to userinfo email
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw exists in the org.keycloak.broker.oidc package where the OIDC broker incorrectly synchronizes the email_verified claim. When an OIDC identity provider is configured with trustEmail=true and the userinfo endpoint is enabled, Keycloak retrieves the email address from the userinfo response but retrieves the email_verified status exclusively from the id_token. The root cause is a lack of validation ensuring that the email_verified claim in the id_token actually refers to the email address returned by the userinfo endpoint. If these two sources return different email addresses, the id_token's email_verified=true claim is blindly applied to the userinfo email. Exploitation Conditions: The OIDC identity provider must have trustEmail set to true (non-default). The userinfo endpoint must be enabled (default). The attacker must control or have compromised the upstream OIDC provider. Concrete Impact: Mark arbitrary email addresses as verified in the Keycloak database. Bypass email-based security controls or verification workflows. Potential account takeover if the application relies solely on the email_verified flag from the IdP to link accounts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1288
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak组织开源的一种开源身份和访问管理解决方案。 Keycloak存在输入验证错误漏洞，该漏洞源于OIDC代理在同步email_verified声明时缺乏验证，可能导致将任意电子邮件地址标记为已验证，绕过基于电子邮件的安全控制或验证工作流，以及潜在的账户接管。
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 - cpe:/a:redhat:build_keycloak:
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 Data Grid 8 - cpe:/a:redhat:jboss_data_grid: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-2026-14781

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III. Intelligence Information for CVE-2026-14781

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Vendor Advisories for CVE-2026-14781 (2)

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-1288

V. Comments for CVE-2026-14781

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