OWASP Automated Threats

Deplete goods or services stock without ever completing the purchase or committing to the transaction.

What is Account Denial of Inventory?

Selection and holding of items from a limited inventory or stock, but which are never actually bought, or paid for, or confirmed, such that other users are unable to buy/ pay/confirm the items themselves. It differs from OAT-005 Scalping in that the goods or services are never actually acquired by the attacker.

Denial of Inventory is most commonly thought of as taking Ecommerce items out of circulation by adding many of them to a cart/basket; the attacker never actually proceeds to checkout to buy them but contributes to a possible stock-out condition. A variation of this automated threat event is making reservations (e.g. hotel rooms, restaurant tables, holiday bookings, flight seats), and/or click-and-collect without payment. But this exhaustion of inventory availability also occurs in other types of web application such as in the assignment of non-goods like service allocations, product rations, availability slots, queue positions, and budget apportionments.

If server resources are reduced see OAT-015 Denial of Service instead. Like OAT-005 Scalping, Denial of Inventory also reduces the availability of goods or services.

Denial of Inventory is also known by terms such as hoarding, hold all attack, inventory depletion, inventory exhaustion and stock exhaustion.


The symptoms of Denial of Inventory

  • 1
    Inventory balances reduce quickly
  • 2
    Increased stock held in baskets or reservations
  • 3
    Elevated basket abandonment
  • 4
    Reduced use of payment step
  • 5
    Increasing complaints from users being unable to obtain goods/services


Sectors targeted by Denial of Inventory

  • Education
  • Entertainment
  • Financial
  • Government
  • Health
  • Retail
  • Technology


Can InfiSecure prevent Denial of Inventory?

InfiSecure blocks bots that engage in inventory exhaustion activities using advanced bot detection capabilities.