Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-v4jw-m6rm-399h
Advisory ID github_osv/GHSA-v4jw-m6rm-399h
Aliases CVE-2026-0871
Summary Keycloak Server Private SPI: Improper Access Control Allows Administrators to Bypass Attribute Visibility Restrictions and Modify Unmanaged User Profile Attributes 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.
Status Published
Exploitability 0.5
Weighted Severity 4.4
Risk 2.2
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (2)
CWE-284 Improper Access Control
CWE-266 Incorrect Privilege Assignment
System Score Found at
cvssv3.1 4.9 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-v4jw-m6rm-399h/GHSA-v4jw-m6rm-399h.json
generic_textual MODERATE
Reference id Reference type URL
https://bugzilla.redhat.com/show_bug.cgi?id=2428881
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/9d0f679ecea405958f167fcd0f4a6db6ae32c3fa
https://github.com/keycloak/keycloak/issues/45873
CVE-2026-0871 https://access.redhat.com/security/cve/CVE-2026-0871
CVE-2026-0871 https://nvd.nist.gov/vuln/detail/CVE-2026-0871
RHSA-2026:2365 https://access.redhat.com/errata/RHSA-2026:2365
RHSA-2026:2366 https://access.redhat.com/errata/RHSA-2026:2366
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-v4jw-m6rm-399h/GHSA-v4jw-m6rm-399h.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-27T16:51:23Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/0xxx/CVE-2026-0871.json

Source Advisory: vulnrichment/CVE-2026-0871

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]