lib/omniauth/failureendpoint.rb in OmniAuth before 1.9.2 (and before 2.0) does not escape the messagekey value.
{
"source": [
"CPE_RANGE",
"CPE_STRING",
"REFERENCES"
],
"cpe": [
"cpe:2.3:a:omniauth:omniauth:*:*:*:*:*:-:*:*",
"cpe:2.3:a:omniauth:omniauth:2.0.0:pre.rc1:*:*:*:*:*:*"
],
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.9.2"
},
{
"introduced": "2.0.0-pre\\.rc1"
},
{
"last_affected": "2.0.0-pre\\.rc1"
}
]
}