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Angular · Theory

Security

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Theory

38/43

Security

Angular sanitizes template bindings by default. Don’t bind untrusted HTML with [innerHTML] unless you ran DomSanitizer.bypassSecurityTrustHtml after you really trust it.

XSS is the viva word: user bio with <script>. Keep it text. CSRF on cookie APIs — HttpClient has helpers. Trap: bypass sanitizer ‘to make it work’ on user content.

Exam tip

XSS + why not innerHTML. Sanitizer.

Example

import { Component } from "@angular/core";

@Component({
  selector: "app-root",
  template: `
    <h1>{{ title }}</h1>
    <button (click)="toggle()">Toggle</button>
    <p *ngIf="open">Panel open</p>
  `,
})
export class AppComponent {
  title = "Angular practice";
  open = true;
  toggle() {
    this.open = !this.open;
  }
}

Security: toggle open. Say whether the panel is on screen after one click.

Short notes

  • DefTemplates are sanitized. Don’t innerHTML user text.
  • RuleBypass only after you trust the source.
  • TrapbypassSecurityTrustHtml on bios.

Questions

1

How does Angular help with XSS?

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