mcp-server-semgrep/semgrep-rules/javascript/express/security/audit/express-check-csurf-middleware-usage.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: express-check-csurf-middleware-usage
  message: >-
    A CSRF middleware was not detected in your express application. Ensure you are either using one such
    as `csurf` or `csrf` (see rule references) and/or you are properly doing CSRF validation in
    your routes with a token or cookies.
  metadata:
    category: security
    references:
    - https://www.npmjs.com/package/csurf
    - https://www.npmjs.com/package/csrf
    - https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html
    cwe:
    - 'CWE-352: Cross-Site Request Forgery (CSRF)'
    owasp:
    - A01:2021 - Broken Access Control
    technology:
    - javascript
    - typescript
    - express
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: HIGH
    confidence: LOW
  languages:
  - javascript
  - typescript
  severity: INFO
  patterns:
  - pattern-inside: |
      $EXPRESS = require('express')
      ...
  - pattern-not-inside: |
      import {$CSRF} from 'csurf'
      ...
  - pattern-not-inside: |
      require('csurf')
      ...
  - pattern-not-inside: | # filter out applications that use this alternate csrf library
      import {$CSRF} from 'csrf'
      ...
  - pattern-not-inside: | # filter out applications that use this alternate csrf library
      require('csrf')
      ...
  - pattern: |
      $APP = $EXPRESS()