The Identity Provider (IdP) server in Ipsilon 0.1.0 before 1.0.1 does not properly escape certain characters in a Python exception-message template, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via an HTTP response.
https://pagure.io/ipsilon/a503aa9c2a30a74e709d1c88099befd50fb2eb16