Trusted Domain CORS Scanner
Summary: PortSwigger released a Burp Suite extension called Trusted Domain CORS Scanner, version 1.1.0 by Thomas Stacey, that adds scan checks for permissive CORS issues including URL validation bypasses drawn from PortSwigger's bypass cheat sheet and Corben Leo's paper on advanced CORS exploitation. The extension also runs a trusted domain scanner that checks whether listed domains are trusted by an application's CORS policy, then tests each for URL validation bypasses, with optional external subdomain lookup via columbus.elmasy.com disabled by default.
What you should know: The extension targets a specific blind spot: applications that implement CORS for a trusted domain but not for themselves, leaving attack surface that standard checks miss. A tool that automates finding and testing those trusted domains changes how quickly a permissive CORS misconfiguration can be turned into a working exploit.
Read the original at PortSwigger Research ↗
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