A vulnerability in ipsilon 2.0 before 2.0.2, 1.2 before 1.2.1, 1.1 before 1.1.2, and 1.0 before 1.0.3 was found that allows attacker to log out active sessions of other users. This issue is related to how it tracks sessions, and allows an unauthenticated attacker to view and terminate active sessions from other users. It is also called a "SAML2 multi-session vulnerability."
https://pagure.io/ipsilon/c/511fa8b7001c2f9a42301aa1d4b85aaf170a461c
https://ipsilon-project.org/release/2.1.0.html
https://ipsilon-project.org/advisory/CVE-2016-8638.txt
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8638