👀 Views: 18 💬 Answers: 1 📅 Created: 2025-06-07

angular security xss javascript

This might be a silly question, but I'm working on an Angular application (version 12.1.0) where I'm using `ng-bind-html` to render user-generated content that includes markdown formatting... Recently, I found out that my application is potentially vulnerable to XSS (Cross-Site Scripting) since I am not properly sanitizing the content before binding it to the view. I tried using Angular's `DomSanitizer` to sanitize the HTML, but the resulting output is not rendering the intended HTML correctly, and I'm seeing the raw HTML tags instead. Here's a snippet of my current implementation: ```javascript import { Component } from '@angular/core'; import { DomSanitizer } from '@angular/platform-browser'; @Component({ selector: 'app-markdown-renderer', template: `<div [innerHTML]="sanitizedContent"></div>` }) export class MarkdownRendererComponent { content = '<h1>Title</h1><script>alert("XSS");</script>'; sanitizedContent; constructor(private sanitizer: DomSanitizer) { this.sanitizedContent = this.sanitizer.bypassSecurityTrustHtml(this.content); } } ``` When I run this, I see the raw tags like `<h1>Title</h1>` in my browser instead of the rendered HTML. I understand that using `bypassSecurityTrustHtml` might open up security risks if the input is not controlled, but I'm stuck on how to properly sanitize and still render valid HTML for user-generated content. I’ve also tried using libraries like `ngx-markdown`, but I'm concerned about how it handles security internally. What is the best practice for safely rendering user-generated HTML in Angular while ensuring that I maintain the intended formatting? Any insights on how to avoid XSS while using `ng-bind-html` or other methods would be greatly appreciated. My development environment is Linux. Thanks in advance! Thanks in advance! For context: I'm using Javascript on macOS. Is there a better approach?