Privilege escalation in Red Hat Build Of Keycloak 26.4
CVE-2026-0871
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:2365 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:2366 (vendor-advisory, Vendor Advisory)
- access.redhat.com/security/cve/CVE-2026-0871 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-0871?
- CVE-2026-0871 is a medium-severity vulnerability in Red Hat Build Of Keycloak 26.4, classified under Incorrect Privilege Assignment. CVSS score: 4.9/10. Published 2026-02-27.
- How severe is CVE-2026-0871?
- Medium severity. CVSS v3 base score is 4.9 out of 10.