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CVE-2016-8638

Session Fixation in ipsilon

9.1 CriticalFix available

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."

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
High

Exploit likelihood

2.14%Up 1.0 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 9.1

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."

Record
CVE-2016-8638
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 2.0
6.4 MediumAV:N/AC:L/Au:N/C:P/I:N/A:P
Weakness
CWE-384
Updated
2026-11-02
CVE List No score

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."

Record
CVE-2016-8638
Updated
2026-11-02
EUVDEUVD-2022-2125 No score

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."

Record
EUVD-2022-2125
Updated
2026-11-03
GitHub AdvisoriesGHSA-376m-3rm2-9jm6 9.1

Session Fixation in ipsilon

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."

Record
GHSA-376m-3rm2-9jm6
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness
CWE-384
Updated
2026-11-02
OSVGHSA-376m-3rm2-9jm6 9.1

Session Fixation in ipsilon

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."

Record
GHSA-376m-3rm2-9jm6
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness
CWE-384
Updated
2026-11-02
OSVPYSEC-2026-360 9.1

Session Fixation in ipsilon

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."

Record
PYSEC-2026-360
CVSS 3.0
9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVRHSA-2016:2809 8.2

Red Hat Security Advisory: ipsilon security update

Record
RHSA-2016:2809
CVSS 3.0
8.2 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ipsilon
PyPI
 2.0.0 up to 2.0.2
2.0.2
ipsilon
PyPI
 1.2.0 up to 1.2.1
1.2.1
ipsilon
PyPI
 1.1.0 up to 1.1.2
1.1.2
ipsilon
PyPI
 1.0.0 up to 1.0.3
1.0.3
ipsilon
PyPI
 1.0.0 up to 1.0.3, 1.1.0 up to 1.1.2, 2.0.0 up to 2.0.2, 1.2.0 up to 1.2.1
1.0.31.1.22.0.21.2.1
ipsilon
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-authform
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-authgssapi
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-authldap
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-base
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
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Affected packages
PackageAffectedFixed
ipsilon-client
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-filesystem
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-infosssd
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-persona
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-saml2
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-saml2-base
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3
ipsilon-tools-ipa
Red Hat:enterprise_linux:7::server
 before 0:1.0.0-13.el7_3
0:1.0.0-13.el7_3

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-8638 is a critical vulnerability (CVSS 9.1) in Ipsilon Project Ipsilon, published July 12, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.14%, the 82nd percentile. Fixed in ipsilon 2.0.2.

References

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