CVE-2026-96447: Keycloak-services: keycloak-services: stateless token preferred_username fallback enables identity rebinding
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.2%
EPSS score, percentile 13.5 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 4.2 Medium
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
- Which versions are affected?
Unaffected 26.6.8-2; 26.6-24; 26.6-24
Source: CISA KEV 2026.11.10, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
Keycloak-services: keycloak-services: stateless token preferred_username fallback enables identity rebinding
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.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
Workaround (from the CVE record)
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (6 products)
| Status | Versions |
|---|---|
| Unaffected | 26.6.8-2 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 26.6-24 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 26.6-24 |
Versions not listed are: affected.
| Status | Versions |
|---|
Versions not listed are: unaffected.
| Status | Versions |
|---|
Versions not listed are: unaffected.
| Status | Versions |
|---|
Versions not listed are: unaffected.
Versions the record lists as unaffected: 26.6.8-2, 26.6-24.
Source: CVE List, as of . About the data.
Weakness
CWE-287
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published |
References
2
Known exploited Red Hat vulnerabilities
- CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability
- CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability
- CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability
- CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability
- CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability