CVE-2026-97175: Keycloak-services: keycloak-services: unverified idp email auto-linking enables account takeover

Published Nov 5, 2026

Updated

A flaw was found in the idp-auto-link authenticator of the keycloak-services component, which handles user identity federation. The issue occurs when Keycloak automatically links an incoming identity from an external provider to an existing local account based on an email address without verifying if the provider has validated that email. This can allow an attacker to take over a victim's account by using a matching unverified email address at a brokered provider.

Event History

Nov 5, 2026

CVE Published

via MITRE·05:16 PM

Data Sourced

via MITRE·05:16 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·06:17 PM

DescriptionSeverityWeakness

Frequently Asked Questions

Which deployments are exposed?

Deployments using the idp-auto-link authenticator with a brokered external identity provider are exposed when that provider can supply an email address that it has not verified. The risk applies where a matching email already belongs to an existing local account.

What does an attacker need to exploit this issue?

The attacker needs low privileges and an identity at a brokered provider that presents the target account's email address without that email having been validated by the provider. No user interaction is required.

CVE-2026-97175: Keycloak-services: keycloak-services: unverified idp email auto-linking enables account takeover

Event History

Frequently Asked Questions

Which deployments are exposed?

What does an attacker need to exploit this issue?

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Frequently Asked Questions

Which deployments are exposed?

What does an attacker need to exploit this issue?