CVE-2026-8191 — Wavlink NU516U1 M16U1_V240425 Command Injection

title: CVE-2026-8191 - Wavlink NU516U1 Command Injection via wifi_region
id: scw-2026-05-09-ai-1
status: experimental
level: critical
description: |
  Detects attempts to exploit CVE-2026-8191 by targeting the wifi_region function in adm.cgi. The rule looks for specific parameters 'skiplist1' or 'skiplist2' within the query string, combined with indicators of command injection like 'ping' and a space, which are characteristic of the exploit targeting the affected Wavlink device.
author: SCW Feed Engine (AI-generated)
date: 2026-05-09
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8191/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/cgi-bin/adm.cgi'
      cs-uri-query|contains:
          - 'wifi_region'
      cs-uri-query|contains:
          - 'skiplist1'
      cs-uri-query|contains:
          - 'skiplist2'
      cs-uri-query|contains:
          - 'ping'
      cs-uri-query|contains:
          - ' ' 
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse