Reflective Cross-site Scripting Vulnerability in twitter-bootstrap-rails

The twitter-bootstrap-rails Gem for Rails contains a flaw that enables a
reflected cross-site scripting (XSS) attack. This flaw exists because the
bootstrap_flash helper method does not validate input when handling flash
messages before returning it to users. This may allow a context-dependent
attacker to create a specially crafted request that would execute arbitrary
script code in a user's browser session within the trust relationship between
their browser and the server.