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Vulnerabilities

Vulnerability · CVE-2016-8638

Session Fixation in ipsilon

Published May 14, 2022 · catalog updated Oct 27, 2026 · Session Fixation in ipsilon

Last checked Oct 28, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2016-8638. EPSS is 2.14%. Act only if a listed version of Session Fixation in ipsilon is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Session Fixation in ipsilon).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.14%
Remediation
Advisory link
Affected products
PyPI 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."

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • PyPI ipsilon1.0.0 → 1.0.3
  • PyPI ipsilon1.1.0 → 1.1.2
  • PyPI ipsilon1.2.0 → 1.2.1
  • PyPI ipsilon2.0.0 → 2.0.2

How to fix CVE-2016-8638

  • Upgrade

    CVE-2016-8638 lists a fix boundary at 1.0.3. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in 1.0.0 → 1.0.3 · 3 other packages on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2016-8638. EPSS is 2.14%. Act only if a listed version of Session Fixation in ipsilon is installed.

Which versions are affected?

Compare what you have installed with 1.0.0 → 1.0.3, 1.1.0 → 1.1.2, 1.2.0 → 1.2.1, 2.0.0 → 2.0.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-384. EPSS 2.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 14, 2022 · PyPA Advisory Database

    Detected

    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."

  2. Oct 27, 2026 · PyPA Advisory Database

    Fix available

    ipsilon fixed in 2.0.2; ipsilon fixed in 1.2.1; ipsilon fixed in 1.1.2; ipsilon fixed in 1.0.3

  3. Oct 27, 2026 · PyPA Advisory Database

    Fix available

    ipsilon fixed in 2.0.2

  4. Oct 27, 2026 · PyPA Advisory Database

    Fix available

    ipsilon fixed in 1.2.1

  5. Oct 27, 2026 · PyPA Advisory Database

    Fix available

    ipsilon fixed in 1.1.2

  6. Oct 27, 2026 · PyPA Advisory Database

    Fix available

    ipsilon fixed in 1.0.3

  7. Oct 27, 2026 · PyPA Advisory Database

    Updated

    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."

Sources

References

Freshness

Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • PyPA Advisory DatabaseOct 28, 2026
  • CVE.orgOct 27, 2026