# Missing Authentication for Critical Function (CWE-306)

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

**Stack:** JavaScript

- Prevalence: Hoch Häufig ausgenutzt
- Impact: Hoch 6 Regeln mit hohem Schweregrad
- Prevention: Dokumentiert 6 Fix-Beispiele

**OWASP:** Identification and Authentication Failures (A07:2021-Identification and Authentication Failures) - #7

## Description

As data traverses trust boundaries, the data should be validated before being processed. When authentication is not applied to critical functions, attackers can invoke these functions without proving their identity.

## Prevention

### JavaScript

Add @UseGuards decorator with authentication guard at controller or method level

## Warning Signs

- [HIGH] NestJS endpoint has no @UseGuards() decorator for authentication

## Consequences

- Privilegien erlangen
- Anwendungsdaten lesen
- Anwendungsdaten ändern
- Nicht autorisierten Code ausführen

## Mitigations

- Software in Komponenten mit unterschiedlichen Vertrauensstufen aufteilen
- Alle Bereiche mit sicherheitskritischer Funktionalität identifizieren und Authentifizierung für sie alle vorschreiben
- Sicherstellen, dass angemessene Zugriffskontrollen durchgesetzt werden

## Detection

- Total rules: 6
- Languages: python, go, typescript

## Rules by Language

### Typescript (1 rules)

- **NestJS Endpoint Missing Authentication Guard** [HIGH]: Endpoints without @UseGuards or @Public decorators are accessible to
unauthenticated users, enabling unauthorized access.
  - Remediation: Add @UseGuards decorator at controller or method level.

```typescript
import { UseGuards } from '@nestjs/common';
import { JwtAuthGuard } from '../auth/jwt-auth.guard';

@Controller('users')
@UseGuards(JwtAuthGuard)
export class UsersController {
  @Get(':id')
  findOne(@Param('id') id: string) {
    return this.usersService.findOne(id);
  }
}
```

Learn more: https://shoulder.dev/learn/typescript/cwe-306/missing-auth-guard