CVE-2026-0871

🔶 medium

Summary

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.

CVSS Score

4.9

Medium

EPSS Score

0.0

Exploit Probability

Published Date

2026-02-27

First Seen: 2026-02-28

📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 14.9% of all 318,071 vulnerabilities in our database.

#270,780

Below average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Feb 27, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Partial

Limited system impact

SSVC data provided by CISA

Last Modified 2026-03-05

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-266

📦 Affected Products 3

Vendor	Product	Status	Affected Versions
redhat	keycloak	Affected	< 26.4.0
redhat	build_of_keycloak	Affected	< 26.4.9
redhat	build_of_keycloak	Affected	v-

🔗 References 4

https://access.redhat.com/errata/RHSA-2026:2365

Vendor Advisory

https://access.redhat.com/errata/RHSA-2026:2366

Vendor Advisory

https://access.redhat.com/security/cve/CVE-2026-0871

Vendor Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=2428881

Issue Tracking Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-37977	ℹ️ low	3.7	0.0	A flaw was found in Keycloak. A remote attacker can exploit a Cross-Origin Resource Sharing (CORS) header injection vuln...	2026-04-06
CVE-2026-3121	🔶 medium	6.5	0.0	A flaw was found in Keycloak. An administrator with `manage-clients` permission can exploit a misconfiguration where thi...	2026-03-26
CVE-2026-3190	🔶 medium	4.3	0.0	A flaw was found in Keycloak. The User-Managed Access (UMA) 2.0 Protection API endpoint for permission tickets fails to ...	2026-03-26
CVE-2026-3047	⚠️ high	8.8	0.3	A flaw was found in org.keycloak.broker.saml. When a disabled Security Assertion Markup Language (SAML) client is config...	2026-03-05
CVE-2026-3009	⚠️ high	8.1	0.0	A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an...	2026-03-05
CVE-2025-12150	ℹ️ low	3.1	0.0	A flaw was found in Keycloak’s WebAuthn registration component. This vulnerability allows an attacker to bypass the co...	2026-02-27

These CVEs affect the same products