You can use Adaptavists Content Formatting Macros. Don't be afraid, it's free ;) Ignore the "Paid by Atlassian"
There you find a iframe macro!
But as Marco said, its a question of security.
My recommendation would be, to write a own (user) macro, if the number of pages you wanna embed is small.
this is feasible but recommended for security reason. The plugin is disabled by default.
Please take a look at https://confluence.atlassian.com/display/DOC/Enabling+the+html-include+Macro
Hope this helps
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