CVE-2026-96447 (GCVE-0-2026-96447)

Vulnerability from cvelistv5 – Published: 2026-11-06 06:02 – Updated: 2026-11-06 17:36
VLAI
Title
Keycloak-services: keycloak-services: stateless token preferred_username fallback enables identity rebinding
Summary
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.
Severity
4.2 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 17:35 UTC
CWE
  • CWE-287 - Improper Authentication
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1129 records in the last 180 days details
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:95761 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:95762 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-96447 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2539288 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6.8-2 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6-24 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6.8     cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
Create a notification for this product.
Date Public
2026-11-05 00:00
Credits
Red Hat would like to thank Bruno Oliveira of IBM in collaboration with OpenAI for reporting this issue.
Show details on NVD website
To clipboard 

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