Cyber Risks · PortSwigger Research

Burp Intruder payload types - Port Swigger

Summary: PortSwigger's documentation for Burp Intruder describes the payload types the tool can inject into a base request, from simple wordlists and runtime file reads to custom iterators that permute up to eight template positions and character substitution rules that turn "peter" into variants like "p3t3r". It also covers recursive grep payloads that pull text from a prior response into the next request, illegal Unicode encodings for filter bypass, and bit flippers for testing CBC-mode encrypted values.

Why it matters: The recursive grep type requires a resource pool capped at one concurrent request, and the numeric generator warns of precision loss past roughly 12 digits because Burp uses double-precision floats - details that decide whether an automated attack returns clean data or quietly wrong results.

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Topics
Vulnerabilities & Patching
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