mcp-server-semgrep/semgrep-rules/javascript/browser/security/raw-html-join.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: raw-html-join
  message: >-
    User controlled data in a HTML string may result in XSS
  metadata:
    cwe:
    - "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
    owasp:
    - A07:2017 - Cross-Site Scripting (XSS)
    - A03:2021 - Injection
    references:
    - https://owasp.org/www-community/attacks/xss/
    category: security
    technology:
    - browser
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages:
  - javascript
  - typescript
  severity: WARNING
  patterns:
  - pattern-either:
    - patterns:
      - pattern: |
          [..., $STRING, ...].join(...)
      - metavariable-pattern:
          metavariable: $STRING
          language: generic
          patterns:
              - pattern-either: 
                  - pattern: |
                      ... </$TAG
                  - pattern: |
                      <$TAG ...
      - pattern-not: |
          [..., "$HARDCODED", ...].join("...")