Two issues, both involving M_goodAttributes in FormattedText.java
1) Although embed is an allowed tag, the required 'pluginspage' attribute is not. See http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_1270
2) Specifically, when embedding flash, using the 'flashvars' attribute to pass arguments to the flash player would be very convenient, and in some cases (such as streaming) is required.
While most of these can be passed in via flashvars, there are also some attributes which object/embed tags support that are not allowed. They include:
I apologize if this is categorized incorrectly, Im unfamiliar with the components of Sakai.