CVE-2026-37981 — Keycloak Information Disclosure

title: Keycloak User Enumeration via Account Resources - CVE-2026-37981
id: scw-2026-05-19-ai-1
status: experimental
level: high
description: |
  Detects attempts to enumerate Keycloak users by exploiting a broken access control vulnerability in the Account Resources user lookup endpoint. This rule specifically looks for GET requests to the '/admin/realms/{realm}/users' endpoint with an 'email=' query parameter, which is indicative of the exploit pattern described in CVE-2026-37981. Successful exploitation allows an authenticated user to harvest PII for all realm users.
author: SCW Feed Engine (AI-generated)
date: 2026-05-19
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-37981/
tags:
  - attack.discovery
  - attack.t1083
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/admin/realms/'
      cs-uri|contains:
          - '/users'
      cs-uri-query|contains:
          - 'email='
      cs-method:
          - 'GET'
      sc-status:
          - '200'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse