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Mephisto blog is vulnerable to XSS



Hello everyone!

Current bleeding-edge version of Mephisto blog is vulnerable to XSS. Comment's author name accept javascript code. If admin approves/ rejects comments manually, he have to load all unapproved comments, so it's possible to fetch his session id.

Example

Add new comment with the following author name: <script>alert (document.cookie)</script> Then from admin's overview section check this comment - you'll see message with cookie.
If you manually approve your comments, check list of pending comments.

How to fix it

patch for <approot>/app/helpers/application_helper.rb :

5c5
<     return comment.author if comment.author_url.blank?
---
>     return h(comment.author) if comment.author_url.blank?

Best wishes!
Sergey Tikhonov