This update fixes a number of issues reported since the last release and makes some changes to the way event attributes - eg: onclick, onload etc. - are handled. In addition, an important security update is included to prevent potential cross-site scripting attacks.
Event Attribute Changes
The Rollover effect provided by the Image Manager uses event attributes, and so the Allow Event Attributes will now need to be enabled to use this feature. Existing rollover effects will be protected if the option is not enabled.
A Security Update
An article was recently published which demonstrated that many popular WYSIWYG editors were and are vulnerable to a cross-site scripting attack when pasting content copied from a malicious site, by taking advantage of event attributes in the copied HTML. As JCE uses a version of the Tinymce editor mentioned in the article, it too was vulnerable to this potential exploit. This update fixes the issue by removing all event attributes from pasted content copied from external sources, unless explicitely allowed in the Clipboard parameters.
In addition to this, better processing of HTML comments and media elements, and a fix in the Visual Characters feature , remove other potential instances where similar exploits could be executed by a user.
It should be noted that these issues require the editor to be active, either by a malicious user creating or editing content, or by a user inadvertantly pasting in content from a malicious website. Nevertheless, all users are advised to update to JCE 2.8.15 as soon as possible.
A changelog is available to view here
Download and Installation
Instructions for installing and updating JCE for each Joomla version are available here