Cross site scripting on ads.twitter.com

How it was found

Hi,

Steps to reproduce the issue:

1. Go to this link https://ads.twitter.com/accounts/XXXX/tweets where is XXXX is your account id.

2. Click on Compose Tweet option and enter "><svg/onload=prompt(123);>

3. Click on "Tweet" Button now.

You will prompt dialog box with "123" in it.

POC video: https://www.dropbox.com/s/64li7wv7gq2brlz/twitterxss.mov?dl=0

Please fix this.

Best Regards, Anand Prakash