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Advisory severityMedium4.8Red Hat Linux

Medium [CVE-2026-14781] OIDC email_verified claim incorrectly applied to userinfo email

This medium-severity Red Hat Linux advisory covers CVE-2026-14781 affecting Red Hat Build of Keycloak.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-14781 Source published Source updated

VulniPulse record published Record updated

CVE-2026-14781
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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 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. Successful exploitation allows an attacker to cause an arbitrary email address to be marked as verified in Keycloak without proper validation.

Red Hat severity: Moderate — CVSS 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N). Weakness: CWE-1288.

Is CVE-2026-14781 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-14781 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-14781?

The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · medium-confidence parse· fetched 13 days ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.

Official advisory · medium-confidence parse· fetched 13 days ago·verify at source

Mitigation

The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.

Official advisory · medium-confidence parse· fetched 13 days ago·verify at source

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