Dear list members,
a security issue has been identified (big thanks to Nicolas Schäfli) and fixed for ILIAS versions >= 5.0.
It was possible to upload HTML files as media objects (e.g. in wiki pages) which could be used to inject JavaScript.
According to the Jour Fixe decision the responsible component maintainer introduced some changes regarding the handling of HTML files uploaded as media objects.
Jour Fixe, FEB 13, 2017: "To patch this problem we decided to prohibit the upload of HTML and the interpretation of HTML in media objects for 5.0 to 5.2."
If *.html files are uploaded they are always renamed to *.sec now (similar to the handling of executables). The rendering has been deactivated. Existing *.html files (uploaded before the patch) are not rendered anymore, but there isn't a concept of deleting/renaming these files, yet.
Best regards, Michael Jansen
on behalf of the ILIAS e.V. and the Technical Board