Grab: [growth.grab.com] Reflected XSS via Base64-encoded "q" param on "my.html" Valentine's microsite

Hi, An encoded injection in the q parameter on my.html can be used to reflect JavaScript in the growth.grab.com context. This microsite creates a "Grab's Valentine" card for a driver over the past year, and carries its data in Base64 format. Proof of concept Please visit the following URL, scroll...