rebenitez1802 commented on PR #40622:
URL: https://github.com/apache/superset/pull/40622#issuecomment-4602307771

   One substantive thing before merge: the transformer can be bypassed with a 
leading control character.
   
   .trim() only strips whitespace, and the scheme comparison uses 
replace(/\s/g, '') — neither covers the non-whitespace C0 controls (\x00–\x08, 
\x0e–\x1f). Browsers (per the WHATWG URL parser) strip all leading C0 controls 
+ space before resolving the scheme, so \x01javascript:alert(1) executes on 
click but passes through this transformer untouched.


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