A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf of a user. The issue occurs because Keycloak fails to verify that a client is authorized to use the CIBA flow, allowing public clients to bypass security requirements. An attacker could use this flaw to trick a user into approving a login request, eventually gaining full access to the users account without needing a client secret.
Metrics
Affected Vendors & Products
References
History
Thu, 15 Oct 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Tue, 13 Oct 2026 08:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Redhat build Of Keycloak
Redhat single Sign-on |
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| Vendors & Products |
Redhat build Of Keycloak
Redhat single Sign-on |
Tue, 13 Oct 2026 00:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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| Metrics |
threat_severity
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threat_severity
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Mon, 12 Oct 2026 07:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Redhat red Hat Single Sign On
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| CPEs | cpe:/a:redhat:red_hat_single_sign_on:7 | |
| Vendors & Products |
Redhat red Hat Single Sign On
|
Mon, 12 Oct 2026 07:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf of a user. The issue occurs because Keycloak fails to verify that a client is authorized to use the CIBA flow, allowing public clients to bypass security requirements. An attacker could use this flaw to trick a user into approving a login request, eventually gaining full access to the users account without needing a client secret. | |
| Title | Keycloak-services: keycloak-services: ciba confidential-only contract not enforced for public clients | |
| First Time appeared |
Redhat
Redhat build Keycloak |
|
| Weaknesses | CWE-287 | |
| CPEs | cpe:/a:redhat:build_keycloak: | |
| Vendors & Products |
Redhat
Redhat build Keycloak |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-10-12T06:18:08.096Z
Updated: 2026-10-15T15:16:24.543Z
Reserved: 2026-10-12T06:09:06.647Z
Link: CVE-2026-109082
Updated: 2026-10-15T13:11:53.398Z
Status : Awaiting Analysis
Published: 2026-10-12T07:16:36.303
Modified: 2026-10-15T16:33:26.290
Link: CVE-2026-109082