Version 1.2.0 of high_voltage is a security fix. Please upgrade.
The high_voltage static page gem prior to version 1.2.0 allows attackers to cause the Rails app to render arbitrary files as if they are Erb. The attacker can trigger this local file inclusion (LFI) through the use of URL-encoded Unicode characters, which bypass the Ruby
Upgrade to version 1.2.0 of high_voltage:
bundle update high_voltage
If you cannot upgrade easily you can instead subclass
HighVoltage::PagesController to override the
current_page method and remove invalid characters manually. More details on overriding can be found in the high_voltage documentation.
Thanks to Jefferson Venerando for bringing the Unicode exploit to our attention.