require-schema-validation

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Keywords: CWE-20, input validation, Mongoose, schema, security

Requires validation options on Mongoose schema fields to prevent invalid or malicious data.

⚠️ This rule warns by default in the recommended config.

Quick Summary

Aspect	Details
CWE Reference	CWE-20 (Improper Input Validation)
OWASP	A04:2021 - Insecure Design
Severity	Medium (CVSS: 6.1)
Category	Security

Error Message Format

The rule provides LLM-optimized error messages (Compact 2-line format) with actionable security guidance:

🔒 CWE-20 OWASP:A06 CVSS:7.5 | Improper Input Validation detected | HIGH [SOC2,PCI-DSS,HIPAA,GDPR,ISO27001]
   Fix: Review and apply the recommended fix | https://owasp.org/Top10/A06_2021/

Message Components

Component	Purpose	Example
Risk Standards	Security benchmarks	CWE-20 OWASP:A06 CVSS:7.5
Issue Description	Specific vulnerability	`Improper Input Validation detected`
Severity & Compliance	Impact assessment	`HIGH [SOC2,PCI-DSS,HIPAA,GDPR,ISO27001]`
Fix Instruction	Actionable remediation	`Follow the remediation steps below`
Technical Truth	Official reference	OWASP Top 10

Rule Details

Mongoose schemas without validation allow arbitrary data, potentially leading to:

Data corruption
Injection attacks
Business logic bypass

❌ Incorrect

// No validation - accepts any value
const userSchema = new Schema({
  email: String,
  role: String,
  age: Number,
});

✅ Correct

const userSchema = new Schema({
  email: {
    type: String,
    required: true,
    match: /^[^\s@]+@[^\s@]+\.[^\s@]+$/,
    maxlength: 255,
  },
  role: {
    type: String,
    enum: ['user', 'admin', 'moderator'],
    default: 'user',
  },
  age: {
    type: Number,
    min: 0,
    max: 150,
    validate: {
      validator: Number.isInteger,
      message: 'Age must be an integer',
    },
  },
});

Known False Negatives

Dynamic Schema Creation

// ❌ NOT DETECTED
const fields = {};
fields[fieldName] = String;
const schema = new Schema(fields);

When Not To Use It

For flexible schema designs (schemaless approach)
When validation is handled at application layer