CVE-2026-9087

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-9087
A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.

6.4 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://access.redhat.com/security/cve/CVE-2026-9087 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2480172 Issue Tracking Vendor Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*
History

02 Jun 2026, 18:55

Type Values Removed Values Added
References () https://access.redhat.com/security/cve/CVE-2026-9087 - () https://access.redhat.com/security/cve/CVE-2026-9087 - Vendor Advisory
References () https://bugzilla.redhat.com/show_bug.cgi?id=2480172 - () https://bugzilla.redhat.com/show_bug.cgi?id=2480172 - Issue Tracking, Vendor Advisory
CPE cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*
First Time Redhat
Redhat build Of Keycloak

20 May 2026, 17:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-20 17:16

Updated : 2026-06-02 18:55

NVD link : CVE-2026-9087

Mitre link : CVE-2026-9087

CVE.ORG link : CVE-2026-9087

JSON object : View

Products Affected

redhat

  • build_of_keycloak
CWE
CWE-639

Authorization Bypass Through User-Controlled Key