CVE-2026-8750 — H2oai H2o-3 Information Disclosure

title: CVE-2026-8750 - H2oai H2o-3 ImportFiles API Information Disclosure
id: scw-2026-05-17-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-8750 by targeting the importFiles API endpoint in H2oai H2o-3. The vulnerability lies in the handling of file imports, specifically within the PersistNFS.java file, allowing for information disclosure. This rule looks for POST requests to '/importFiles' that contain a query string referencing the vulnerable Java file path, indicating a potential exploit attempt.
author: SCW Feed Engine (AI-generated)
date: 2026-05-17
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8750/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/importFiles'
      cs-method|contains:
          - 'POST'
      cs-uri-query|contains:
          - 'h2o-core/src/main/java/water/persist/PersistNFS.java'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse