Burp Suite Pro 2026 — Five Production Bambdas and Three Custom BChecks (Paste-Ready)
Manish GargAssociate of (ISC)² · RingSafe
May 8, 20266 min read
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Last updated: May 18, 2026
Burp Suite Pro’s Bambdas (per-request JavaScript filters) and BCheck (YAML-defined scanner checks) shipped in 2023 and are now the highest-leverage features in Burp for advanced testers. This module walks through five production-grade Bambdas (auth-token highlighting, sensitive-data leak detection, scope-aware filtering, JWT alg-none detection, parameter pollution finder) and three custom BChecks (open redirect, IDOR via numeric ID swap, CORS misconfiguration). All paste-ready for your engagement.
Most Burp users still scroll through the Proxy history with their eyes. Bambdas turn that into automated triage; BChecks turn one-off vulnerability checks into reusable assets. The investment is hours; the payoff is every engagement going forward.
Bambdas — what they are
A Bambda is a JavaScript snippet that Burp Pro evaluates on every request and response in the Proxy history. It runs in a sandboxed engine; full JS syntax (ES2022); access to requestResponse and helper APIs. Use cases: filter, highlight, modify (with risk), notify.
Configure via Proxy → HTTP history → top-right filter button → Bambda. Save as preset; share via export.
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