CVE-2026-9087 — Keycloak Vulnerability

title: CVE-2026-9087 - Keycloak Cross-Session Verification Exploit Attempt
id: scw-2026-05-20-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-9087 by sending a POST request to a Keycloak realm endpoint with a 'session_code' parameter. This indicates an attempt to leverage the cross-session verification flaw where an attacker might try to link a second upstream account on the same IdP to a victim's local account.
author: SCW Feed Engine (AI-generated)
date: 2026-05-20
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-9087/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/realms/'
      cs-uri-query|contains:
          - 'session_code='
      cs-method:
          - 'POST'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse