Logstash prior to version 2.1.2, the CSV output can be attacked via engineered input that will create malicious formulas in the CSV data.
{
"cpe": "cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*",
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "2.1.1"
}
],
"source": "CPE_RANGE"
}