medium4.9
CVE-2026-0871
Keycloak Server Private SPI: Improper Access Control Allows Administrators to Bypass Attribute Visibility Restrictions and Modify Unmanaged User Profile Attributes
Impact
A flaw was found in Keycloak. An administrator with `manage-users` permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.keycloak:keycloak-server-spi-private | < 26.5.2 | 26.5.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Redhat | Build Of Keycloak | before 26.4.9 All versions |
| Redhat | Keycloak | before 26.4.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://access.redhat.com/errata/RHSA-2026:2365
- https://access.redhat.com/errata/RHSA-2026:2366
- https://access.redhat.com/security/cve/CVE-2026-0871
- https://bugzilla.redhat.com/show_bug.cgi?id=2428881
- https://github.com/advisories/GHSA-v4jw-m6rm-399h
- https://nvd.nist.gov/vuln/detail/CVE-2026-0871
- https://github.com/keycloak/keycloak/issues/45873
- https://github.com/keycloak/keycloak/commit/9d0f679ecea405958f167fcd0f4a6db6ae32c3fa