agent/Core/Controller/SendRequest.cpp in Phusion Passenger before 4.0.60 and 5.0.x before 5.0.22, when used in Apache integration mode or in standalone mode without a filtering proxy, allows remote attackers to spoof headers passed to applications by using an _ (underscore) character instead of a - (dash) character in an HTTP header, as demonstrated by an X_User header.
Exploitability
AV:NAC:HPR:NUI:NScope
S:UImpact
C:NI:LA:N3.7/CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N