Senior LevelVue JS
How do you protect Vue applications against Prototype Pollution and XSS payload injection in route params?
❓ Interview Prompt: Explain Prototype Pollution vulnerabilities, recursively merging untrusted JSON into reactive state, and Zod route param validation.
Prototype Pollution occurs when an attacker injects properties into JavaScript's 'Object.prototype' (via '__proto__' or 'constructor.prototype' in untrusted JSON payloads). If a Vue app shallow merges these payloads into reactive state, attackers can hijack object properties across the application.
Defense Strategies:
1
Sanitize Object Merges: Use 'Object.create(null)' for dictionary maps or use defensive deep-merge libraries that block '__proto__' keys.
2
Schema Validation on Route Params: Validate incoming URL query parameters using Zod schemas inside router 'beforeEnter' guards before passing them to components!
Code Implementation Example
javascript
import { z } from 'zod';
const RouteQuerySchema = z.object({
page: z.coerce.number().default(1),
search: z.string().max(100).default('')
});
// Secure Navigation Guard validating route params
export function validateQueryGuard(to, from, next) {
const result = RouteQuerySchema.safeParse(to.query);
if (!result.success) {
next({ path: to.path, query: {} }); // Reset corrupted query params!
} else {
next();
}
}💡Validating route query parameters using Zod schemas to prevent payload injection.
🎯 Interview Key Takeaway
Validate untrusted JSON payloads and route parameters with Zod schemas to prevent Prototype Pollution and injection attacks.
#Security#Prototype Pollution#Zod#Senior
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