CVE-2026-18214
Keycloak-services: keycloak-services: google external access-token exchange bypasses hosted-domain restriction
- State
- Published
- Severity
- 6.8 Medium
- Published
- Jul 31, 2026
- Updated
- Sep 16, 2026
- Reserved
- Jul 29, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.8 Medium | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N | redhat |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
Red Hat build of Keycloak 26.6Red Hat |
|
Red Hat build of Keycloak 26.6Red Hat |
|
Red Hat build of Keycloak 26.6Red Hat |
|
Red Hat build of Keycloak 26.6.7Red Hat | |
Red Hat build of Keycloak 26.6.7Red Hat | |
Red Hat build of Keycloak 26.6.7Red Hat | |
Red Hat Data Grid 8Red Hat | |
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat | |
Red Hat Single Sign-On 7Red Hat |
References
- RHSA-2026:68277vendor-advisory
- RHSA-2026:68278vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-18214vdb-entry
- RHBZ#2508308issue-tracking
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