Race Condition Hackviser Jun 2026

threads = [] for _ in range(30): t = threading.Thread(target=send) t.start() threads.append(t)

During multi-step registration or profile update processes, temporary session variables might dictate user roles. Forcing concurrent updates to a profile while triggering a role-validation action can sometimes trick the backend into assigning administrative privileges to a standard user account. How Attackers Exploit Race Conditions race condition hackviser

Attacker Request 1: [--- TOC: Check Balance ---] ---------> [--- TOU: Deduct & Withdraw ---] \ / Attacker Request 2: ------------> [--- TOC: Check Balance ---] ---------> [--- TOU: Deduct & Withdraw ---] ^ The Exploit "Race Window" threads = [] for _ in range(30): t = threading

“A payment system checks balance before deducting. Two threads pass the ‘sufficient funds’ check before either deducts, allowing a negative balance.” allowing a negative balance.”