Bypassing rate limits via race conditions

Platform: PortSwigger | Category: Race Conditions | Type: Lab | Difficulty: N/A | OS: N/A | Author: XESXOR | Date: 2026-08-24 | Status: Solved Techniques: Web Security Academy, Race Conditions

Summary

Walkthrough of the PortSwigger Web Security Academy lab Bypassing rate limits via race conditions (Race Conditions). This lab demonstrates a race conditions vulnerability and its exploitation to achieve the lab objectives.

Lab Overview

PortSwigger Web Security Academy — Race Conditions

This writeup is part of the XESXOR PortSwigger collection. The original lab description and solution have been preserved and reformatted for clarity.

Lab Description :

<img width="1119" height="862" alt="image" src="https://github.com/user-attachments/assets/50eaf6d9-63f5-420f-a7e7-ce9a94810f5e" />

Solution :

<img width="1119" height="862" alt="image" src="https://github.com/jimcola99/corruptsvgfile/blob/master/svgavatar.svg" />

Key Takeaways / Lessons

• Understanding Race Conditions detection and exploitation is crucial for web security.
• Always validate and sanitize user input; implement proper access controls.
• This lab is part of the PortSwigger Web Security Academy — practice in a safe, legal environment.

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Crafted by XESXOR Research • 2026-08-24 • PortSwigger Web Security Academy • Lab: Bypassing rate limits via race conditions