Pentester Uses AI to Crack Time-Expiring Cookies in Web App Brute-Force Test

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Security researcher Andrew Trexler published a blog on March 4, 2026, detailing how he used AI assistance during a web application penetration test. He encountered a challenge where login requests expired quickly due to a time-sensitive cookie, making standard Burp Suite replay testing ineffective. Using AI-generated browser console code, he set debugger breakpoints to locate the JavaScript function responsible for generating the cookie. He then fed that code to an AI tool, which rapidly reimplemented the logic in Python, allowing him to build a custom brute-force script. Trexler shared the walkthrough to help web developers understand this attack vector and take steps to better secure their applications.

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