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Vulnerabilities CVE-2026-18214

CVE-2026-18214

Medium
Open
TLP:CLEAR

Keycloak-services: keycloak-services: google external access-token exchange bypasses hosted-domain restriction

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Description

Keycloak allows users to log in using Google accounts and can be configured to only allow users from specific Google Workspace domains. A flaw was found where the token exchange feature, which allows swapping a Google token for a Keycloak token, does not check these domain restrictions. This means an attacker with a valid Google account from a different domain could bypass the security check and gain access to the Keycloak realm.

Details

CVSS Score
6.8
EPSS Score
0.19%

8.8th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Confidence
90%
Published
Jul 31, 2026
Last Modified
Jul 31, 2026
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