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CVE-2016-8638: Session Fixation in ipsilon

May 14, 2022 (updated October 27, 2026)

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.”

References

  • access.redhat.com/errata/RHSA-2016:2809
  • access.redhat.com/security/cve/CVE-2016-8638
  • bugzilla.redhat.com/show_bug.cgi?id=1392829
  • bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8638
  • github.com/advisories/GHSA-376m-3rm2-9jm6
  • github.com/ipsilon-project/ipsilon/commit/1c48414877fc110652b6078a29529972c7ec9122
  • github.com/ipsilon-project/ipsilon/commit/64fc366c054fc6af1d9d2692902db169884b5f78
  • github.com/ipsilon-project/ipsilon/commit/a33303b6beb5c316d7c18b23566b7666a4e307a4
  • github.com/ipsilon-project/ipsilon/commit/b4744a92d4fa7f6d7ade0ae2d99a2dc0ea94734d
  • github.com/pypa/advisory-database/tree/main/vulns/ipsilon/PYSEC-2026-360.yaml
  • ipsilon-project.org/advisory/CVE-2016-8638.txt
  • ipsilon-project.org/release/2.1.0.html
  • nvd.nist.gov/vuln/detail/CVE-2016-8638
  • pagure.io/ipsilon/c/511fa8b7001c2f9a42301aa1d4b85aaf170a461c
  • pypi.org/project/ipsilon

Code Behaviors & Features

Detect and mitigate CVE-2016-8638 with GitLab Dependency Scanning

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Affected versions

All versions starting from 1.0.0 before 1.0.3, all versions starting from 1.1.0 before 1.1.2, all versions starting from 1.2.0 before 1.2.1, all versions starting from 2.0.0 before 2.0.2

Fixed versions

  • 1.0.3
  • 1.1.2
  • 1.2.1
  • 2.0.2

Solution

Upgrade to versions 1.0.3, 1.1.2, 1.2.1, 2.0.2 or above.

Impact 9.1 CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-384: Session Fixation

Source file

pypi/ipsilon/CVE-2016-8638.yml

Spotted a mistake? Edit the file on GitLab.

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