CVE-2026-7720 — Command Injection

title: CVE-2026-7720 - Totolink WA300 Command Injection via setLanguageCfg
id: scw-2026-05-04-ai-1
status: experimental
level: critical
description: |
  Detects exploitation attempts against Totolink WA300 devices by identifying POST requests to /cgi-bin/cstecgi.cgi that include the 'setLanguageCfg' function and the 'langType' parameter, along with common command injection characters (&&, ;, |) within the query string. This is specific to CVE-2026-7720.
author: SCW Feed Engine (AI-generated)
date: 2026-05-04
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-7720/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/cgi-bin/cstecgi.cgi'
      cs-uri-query|contains:
          - 'setLanguageCfg'
      cs-uri-query|contains:
          - 'langType'
      cs-uri-query|contains:
          - '&&'
      cs-uri-query|contains:
          - ';'
      cs-uri-query|contains:
          - '|'
      cs-method|exact: 'POST'
  condition: cs-uri AND cs-uri-query AND cs-method
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse