We have a wiki with lots of article's containing links to not yet existing images. In this articles the links to this not yet existing images are used to upload images. This makes it fairly easy to quickly add an image to a specific article. Before version 1.16.3 the editors would click such a link and they would be redirected to the upload form. Since 1.16.3 this does not work anymore.
The reason why this doesn't work anymore is due to the recommended rewrite rules to prevent IE6 XSS attacks suggested in 1.16.3 and 1.16.4 (see also bug #28235 https://bugzilla.wikimedia.org/show_bug.cgi?id=28235).
Reproduction of the issue (tested in 1.16.4):
Remove the recommended rewrite rules from Apache, restart Apache and click on a link of a not yet uploaded image. You will be redirected to the upload form.
Would be great if the original feature could be restored. Any clues on how to achieve this? Contact me for more info. I'm more than willing to help solve this.
Thanks for all the great work on Mediawiki!