The Browser Is Not a

Short summary

Single-page applications and frontend frameworks pushed business logic to the browser, creating a dangerous pattern: trusting client-side authorization. Attackers can modify localStorage, inspect network traffic, and bypass UI—all authorization decisions must be validated server-side. Broken Access Control remains the #1 web vulnerability (OWASP A01:2021) because many apps still treat the browser as a security boundary.

• •Browser storage and client-side logic are fully user-controlled and cannot be trusted for authorization decisions
• •OWASP A01:2021 Broken Access Control is the most severe web vulnerability, affecting Meta, Instagram, and enterprise apps
• •All access control must be enforced server-side; hiding UI elements or features provides no real security

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