A flaw was found in the TokenManager component of Keycloak, an open-source identity and access management solution. The issue occurs during the validation of stateless access tokens when the original user ID no longer exists. Keycloak incorrectly falls back to using the username to identify the user without verifying if the identity matches the original token subject. This could allow an attacker with an old token to gain access to a newly created service account if it shares the same client ID as a previously deleted one.
Metrics
Affected Vendors & Products
References
History
Sat, 07 Nov 2026 07:30:00 +0000
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ssvc
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Fri, 06 Nov 2026 17:45:00 +0000
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| References |
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Fri, 06 Nov 2026 10:30:00 +0000
| Type | Values Removed | Values Added |
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| CPEs | cpe:/a:redhat:build_keycloak:26.6::el9 | |
| References |
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Fri, 06 Nov 2026 06:15:00 +0000
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| Title | keycloak-services: keycloak-services: Stateless token preferred_username fallback enables identity rebinding | Keycloak-services: keycloak-services: stateless token preferred_username fallback enables identity rebinding |
| First Time appeared |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
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| CPEs | cpe:/a:redhat:build_keycloak: cpe:/a:redhat:red_hat_single_sign_on:7 |
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| Vendors & Products |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
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| References |
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Fri, 06 Nov 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in the TokenManager component of Keycloak, an open-source identity and access management solution. The issue occurs during the validation of stateless access tokens when the original user ID no longer exists. Keycloak incorrectly falls back to using the username to identify the user without verifying if the identity matches the original token subject. This could allow an attacker with an old token to gain access to a newly created service account if it shares the same client ID as a previously deleted one. | |
| Title | keycloak-services: keycloak-services: Stateless token preferred_username fallback enables identity rebinding | |
| Weaknesses | CWE-287 | |
| References |
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| Metrics |
threat_severity
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cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-11-06T06:02:51.358Z
Updated: 2026-11-06T17:36:13.779Z
Reserved: 2026-09-23T09:37:33.249Z
Link: CVE-2026-96447
Updated: 2026-11-06T17:36:08.485Z
Status : Awaiting Analysis
Published: 2026-11-06T06:16:44.910
Modified: 2026-11-06T18:18:27.347
Link: CVE-2026-96447