Concurrency exploits: The ultimate Bug Bounty guide to exploiting race condition vulnerabilities in web applications

Imagine snapping up a $1,000 gadget for just $12 simply by triggering a race condition in the checkout flow.

Race condition vulnerabilities often lead to severe impacts – such as bypassing business logic, escalating privileges or stealing funds – that code reviews and automated scans readily overlook. With distributed systems and async frameworks making shared-state interactions increasingly complex and error-prone, race-condition exploitation is a skill well worth learning for Bug Bounty hunters.

In this guide, you’ll learn how attackers exploit concurrency flaws, from last-byte synchronisation to single-packet attacks, and how to use Burp Suite’s extension Turbo Intruder. You’ll learn how race condition attacks work, understand the root causes of these timing bugs, and concrete strategies to bulletproof web applications against them.

You can find the full article on YesWeHack’s blog page