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."
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | ipsilon | >= 1.0.0, < 1.0.3, >= 1.1.0, < 1.1.2, >= 2.0.0, < 2.0.2, >= 1.2.0, < 1.2.1 | 1.0.3, 1.1.2, 2.0.2, 1.2.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2016-8638
- https://github.com/ipsilon-project/ipsilon/commit/1c48414877fc110652b6078a29529972c7ec9122
- https://github.com/ipsilon-project/ipsilon/commit/64fc366c054fc6af1d9d2692902db169884b5f78
- https://github.com/ipsilon-project/ipsilon/commit/a33303b6beb5c316d7c18b23566b7666a4e307a4
- https://github.com/ipsilon-project/ipsilon/commit/b4744a92d4fa7f6d7ade0ae2d99a2dc0ea94734d
- https://access.redhat.com/errata/RHSA-2016:2809
- https://access.redhat.com/security/cve/CVE-2016-8638
- https://bugzilla.redhat.com/show_bug.cgi?id=1392829
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8638
- https://github.com/ipsilon-project/ipsilon
- https://ipsilon-project.org/advisory/CVE-2016-8638.txt
- https://ipsilon-project.org/release/2.1.0.html
- https://pagure.io/ipsilon/c/511fa8b7001c2f9a42301aa1d4b85aaf170a461c
- http://rhn.redhat.com/errata/RHSA-2016-2809.html
- http://www.securityfocus.com/bid/94439
- https://pypi.org/project/ipsilon
- https://github.com/advisories/GHSA-376m-3rm2-9jm6
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H- Weakness (CWE)
CWE-384- Platform
- Python (PyPI)
- Package
ipsilon- Disclosed
- 14.05.2022
- Updated
- 11.10.2026 13:17
Sources and licenses
OSV / GitHub Advisory Database - GHSA-376m-3rm2-9jm6 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-360 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: ipsilon
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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