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Hackinglab upload off first question

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

please upload a picture in JPG format Score:

can only upload images in jpg format Oh!
Customs address to see the source code, JS do the file suffix verification, extremely unsafe. Since I did not open the Brupsuit, copy the source code locally and create a new HTML with the following content: 
Remove the JS check, the browser opens this HTML submission, get flag success:)
Hackinglab upload off first question

                

                    
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