web2-vuln-classes

WEB2 BUG CLASSES — 26 Classes

Root cause, pattern, bypass table, chaining opportunity, real paid examples.

Auth-required classes (🔐): the ones below need at least one logged-in session loaded into the hunt to be testable. Use hunt.py --auth-file .private/T.json or --cookie/--bearer flags — every recon/scan tool then inherits the headers automatically. For IDOR/BOLA/priv-esc, load two sessions (low- and high-priv) and diff. See docs/auth-sessions.md.

🔐 IDOR · Broken Auth/Access Control · Mass Assignment · OAuth/OIDC · JWT · GraphQL field-level auth · LLM/AI chatbot IDOR · MFA (rate-limit + response manipulation tests) · ATO chains · SSRF behind login

The MFA workflow-skip and SAML signature-stripping probes intentionally stay unauthenticated even when a session is loaded — that's the attack premise.

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1. IDOR — INSECURE DIRECT OBJECT REFERENCE 🔐

#1 most paid web2 class — 30% of all submissions that get paid. Needs two sessions (A=attacker, B=victim) — load both via --auth-file and diff audit-log session_id hashes to confirm cross-tenant access.

Root Cause

# VULNERABLE — no ownership check
@app.route('/api/orders/<order_id>')
def get_order(order_id):
    order = db.query("SELECT * FROM orders WHERE id = ?", order_id)
    return jsonify(order)  # Never checks if order belongs to current user!

# SECURE
@app.route('/api/orders/<order_id>')
def get_order(order_id):
    order = db.query("SELECT * FROM orders WHERE id = ? AND user_id = ?",
                     order_id, current_user.id)

Variants

• V1: Numeric ID swap — /api/user/123/profile → change to 124
• V2: UUID swap — enumerate UUID via email invite or other endpoint
• V3: Indirect IDOR — POST /api/export?report_id=456 exports another user's report
• V4: Parameter add — ?user_id=other makes backend use it
• V5: HTTP method swap — PUT protected, DELETE not
• V6: Old API version — /v1/users/123 lacks auth that /v2/ has
• V7: GraphQL node — { node(id: "base64(User:456)") { email } }
• V8: WebSocket — WS sends {"action":"get_history","userId":"client-generated-UUID"}