Open Redirect

Unvalidated Redirect Targets • Intermediate

URL Handling
Secure Mode• show fix Session• Cookie Recruiter• Mode

Objective: Redirect users to an external destination.

Try: Change the redirect target parameter.

➡️ Design: Trusted domain → silent redirect → phishing destination.
Everything here is simulated and sandboxed to this site—no real accounts, no real services.
Demo How it works Issue Exploit Fix Video

1) Demo

Here is the feature “working” as implemented in this mode.

App Output
Trusted Link
https://kylerburke.dev/redirect?next=...

Users trust your domain.

Redirect Target
/home
Redirect allowed (simulated)
Response
Status: 302 Found Response Headers: (none)

2) How the code works

This section shows the mental model: what the server is “thinking”.

return redirect(request.query.next);

3) The issue

Redirect targets can be attacker-controlled, enabling phishing.

Real-world impact: Users trust your domain, then get silently sent somewhere malicious.

4) Exploit it

Edit the raw request below. You can change method, path/query, headers, and body. Then send it. The server will parse what you typed and re-run the simulation.

Request Editor
Tip: For secure mode tests, add a cookie like: Cookie: session=1; role=Admin
Parsed View (what the server read)
method: GET path: /redirect?next=/home headers: host: kylerburke.dev body: (empty)

Exploit Editor Hidden (Recruiter Mode)

This mode is designed for sharing your portfolio. It focuses on clear explanation, real-world impact, and fixes—without interactive exploitation.

Want to demo the exploit? Turn Recruiter Mode off and use the Request Editor.

5) Fix

Secure Mode shows the fix behavior. Flip modes and send the same request.

Only allow relative paths or a strict allowlist of destinations.

Video

Short visual explanation to match what you just did.

Swap the YouTube ID in the Worker to pick a different explainer video for this vulnerability.