Before you panic, you should know that this isn't a huge deal, and Comcast is aware of the situation and has promised a fix "within a week or two." There, feel better? Good, because if you use the XFINITY app, any other app that has permission to read logs can read your Comcast username and password (aLogCat, for example).
The details, courtesy of aBSuRDiST, who discovered the issue:
My system log shows <userName>MYUSERNAME@comcast.net</userName> and <password>MYPASSWORD</password> on a line that starts with "D/HTTPManager". I read the log using aLogcat (app available in the market). Open aLogcat, press menu and filter for "password".
104,842
61,896
0
7,975
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