CVE-2026-0871
Improper Access Control in Keycloak Allows Unauthorized User Attribute Modification
Publication date: 2026-02-27
Last updated on: 2026-03-05
Assigner: Red Hat, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| redhat | build_of_keycloak | * |
| redhat | build_of_keycloak | to 26.4.9 (exc) |
| redhat | keycloak | to 26.4.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-266 | A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in Keycloak where an administrator who has the 'manage-users' permission can bypass the 'Only administrators can view' setting for unmanaged attributes. This means that such an administrator can modify these unmanaged attributes even if the system is configured to restrict modifications to them.
The root cause is improper access control, allowing unauthorized changes to user profiles.
How can this vulnerability impact me? :
The impact of this vulnerability is that an administrator with certain permissions can make unauthorized changes to user profiles by modifying unmanaged attributes that should be restricted.
While this does not affect confidentiality or availability, it can lead to integrity issues since unauthorized modifications can occur.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know