DevTools Manipulation

UI restrictions live in JavaScript — anyone can bypass them in DevTools. Server validation is the only real protection.

Try this:Click "Simulate Bypass" to see what an attacker types in DevTools
Simulated AppVulnerable
Premium Feature

Requires subscription. Hidden behind JS flag: window.__fg_unlock

DevTools Console Simulation
Console
Click "Simulate Bypass" to see attacker console commands...
Hidden Data in DOM

<input type="hidden" name="admin_key"

value="sk_live_abc123..." />

What's happening

Any JavaScript variable, HTML attribute, or DOM property can be read and modified by anyone with browser DevTools access. UI restrictions (disabled buttons, hidden fields, JS flags) are purely cosmetic.

Why it's vulnerable

Attackers can: raise form input limits by editing HTML attributes, set JavaScript variables to unlock premium features, read hidden input fields containing secrets, and bypass client-side validation entirely.

How it's fixed

Never trust the client. All business logic, limits, and access checks must be validated on the server. Never store secrets in HTML. Treat all input as potentially manipulated. The server is the source of truth.

Real-world context

Games have been hacked by editing in-memory values (Cheat Engine). E-commerce sites have been exploited by changing price fields. API keys have been stolen from hidden form fields. This is one of the most common real-world attack surfaces.

Security Log(0)

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