security: prevent open redirect in /auth/confirm

[roshanraj9136]

Vulnerability

The /auth/confirm route accepts a next query parameter and redirects to it after OTP verification succeeds:

const next = searchParams.get('next') ?? '/auth/callback'
return NextResponse.redirect(new URL(next, request.url))

An attacker can craft a magic-link confirmation URL like:

/auth/confirm?token_hash=...&type=email&next=https://evil.com

After the user clicks and their OTP verifies, they are redirected to the attacker's site. This enables phishing (fake login page to harvest credentials) or session theft.

Fix

Validate that next is a relative path:

• Must start with /
• Must NOT start with // (protocol-relative URL, e.g. //evil.com)
• Falls back to /auth/callback if invalid

File changed (1)

src/app/auth/confirm/route.ts — 2 insertions, 1 deletion

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📥 Commits

Reviewing files that changed from the base of the PR and between cd02e34 and 0beaf13.

📒 Files selected for processing (1)

• src/app/auth/confirm/route.ts

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