CVE-2026-0871

Name: CVE-2026-0871
Creator: NVD / NIST
Published: 2026-02-27T08:17:09.41+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2026-0871 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. 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. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.9/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

0.31%

22.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-266

Affected Software

Vendor	Product	Versions
Redhat	Build Of Keycloak	< 26.4.9
Redhat	Build Of Keycloak	All versions
Redhat	Keycloak	< 26.4.0

References

https://access.redhat.com/errata/RHSA-2026:2365Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:2366Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-0871Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2428881Issue Tracking, Vendor Advisory

Timeline

Published: Feb 27, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-0871?

How severe is CVE-2026-0871?

CVE-2026-0871 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-0871?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-0871?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST