is a web testing and security auditing tool designed to automate HTTP requests. In simple terms, it can take a large list of username/password combinations (or other data) and rapidly test them against a website’s login form, API endpoint, or any other web input.
OpenBullet works using three main parts: how does openbullet work?
OpenBullet operates on a logical "IF/THEN" structure. It mimics the actions a human user would take on a website but at a massive scale and speed. The process generally follows these steps: is a web testing and security auditing tool
⚠️ : Using OpenBullet against websites you do not own or have explicit written permission to test is illegal in most jurisdictions and violates the terms of service of virtually every online platform. It mimics the actions a human user would
A config is the “script” that tells OpenBullet how to interact with a specific target website. It contains:
OpenBullet is an open-source web testing and automation suite that works by executing user-defined scripts, called "configs," to automate interactions with websites and APIs . Originally built for legitimate tasks like data scraping and security testing, it has become widely known for its misuse in large-scale credential stuffing and account takeover attacks. Kasada +3 How OpenBullet Works: The Technical Core The software operates through a modular system where various components work together to simulate human browsing behavior at high speeds. Transmit Security +1 Configs (The Blueprints): These files contain the exact logic for how the tool should interact with a specific site. They define login URLs, request headers, parsing rules for server responses, and conditions to identify a successful login (a "hit"). Wordlists (Combo Lists): Users load large lists of data—typically username and password pairs—often sourced from previous data breaches. OpenBullet tests these combinations one by one against the target site. The Stacker (Visual Editor): OpenBullet uses a block-based visual editor called the "Stacker". Each "block" represents a specific action, such as sending an HTTP request, parsing JSON/HTML data, or solving a CAPTCHA. Proxies & Multithreading: To avoid being blocked by security systems, OpenBullet supports rotating proxy lists. It uses multithreading to run multiple "bots" simultaneously, allowing for tens of thousands of automated attempts per minute. Browser Integration: Advanced versions like OpenBullet 2 can integrate with headless browser frameworks like