CSTC, Modular HTTP Manipulator
Summary: CSTC is a Burp Suite extension, authored by usdAG and listed at version 1.3.7 with a last update of 23 July 2026, that brings CyberChef-like transformation capabilities into Burp so users can define custom recipes that automatically transform outgoing and incoming HTTP requests and responses. PortSwigger states the extension is written by third-party users of Burp and that it makes no warranty about their quality or usefulness for any particular purpose.
What's compelling: This is third-party code running inside the tool your testers use to intercept and rewrite live HTTP traffic, and PortSwigger explicitly disclaims any warranty on its quality or usefulness - so the review burden for what it does to requests and responses sits with your team, not the vendor.
Read the original at PortSwigger Research ↗
- Topics
- Vulnerabilities & Patching
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