Just download the latest flash player from Adobe site. In my case it was: install_flash_player_10_linux.tar.gz. Unpack the file
tar xzvf install_flash_player_10_linux.tar.gz
Copy contents of install_flash_player_10_linux folder obtained (i.e. files flashplayer-installer and libflashplayer.so) into /usr/lib/epiphany/2.26/plugins. For me it work. I used Arch Linux. Similar procedure can be used for Firefox (plugins folder is /usr/lib/firefox-3.0/plugins).