CMS Safari mobile browser and restricted access
 

I have many of the articles on my site set so only select usergroups (i.e paying members) have access to them. Today however, I discovered that if I access the site with my iPhone using the Safari browser I can access any and all articles. This was the case both when (a) I wasn't logged in, and (b) I logged in as a user who should not have access.

Has this issue been raised before, and if so...is there a fix/mod/patch for it? Running v4.2.0 Patch Level 2