Is CVE-2016-8638 in the CISA KEV catalog?

No. CVE-2016-8638 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-8638?

CVE-2016-8638 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2016-8638?

CVE-2016-8638 has an EPSS score of 2.12% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2016-8638?

No published fix for CVE-2016-8638 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2016-8638

CRITICALEPSS 80th pctl

9.1

CVSS v3

NVD

Description

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."

CWE-384

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.12%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch1

pagure.io

Vendor Advisory1

ipsilon-project.org

Third-Party Advisory2

Other references2

Embed a live status badge for CVE-2016-8638

Markdown

[![CVE-2016-8638](https://tridentstack.com/cve/badge/CVE-2016-8638.svg)](https://tridentstack.com/cve/CVE-2016-8638)

HTML

<a href="https://tridentstack.com/cve/CVE-2016-8638"><img src="https://tridentstack.com/cve/badge/CVE-2016-8638.svg" alt="CVE-2016-8638"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.