Answer in brief
CVE-2016-8638 records a Critical severity (CVSS 9.1) vulnerability in Session Fixation in ipsilon. The current sources do not mark it as known exploited. The current feed maps ipsilon (pip), ipsilon (pip), ipsilon (pip), ipsilon (pip) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps ipsilon (pip), ipsilon (pip), ipsilon (pip), ipsilon (pip) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ipsilonpip | >=2.0.0,<2.0.2 | 2.0.2 |
| ipsilonpip | >=1.2.0,<1.2.1 | 1.2.1 |
| ipsilonpip | >=1.1.0,<1.1.2 | 1.1.2 |
| ipsilonpip | >=1.0.0,<1.0.3 | 1.0.3 |
| ipsilonpypi | >=2.0.0 <2.0.2 | 2.0.2 |
| ipsilonpypi | >=1.2.0 <1.2.1 | 1.2.1 |
| ipsilonpypi | >=1.1.0 <1.1.2 | 1.1.2 |
| ipsilonpypi | >=1.0.0 <1.0.3 | 1.0.3 |
Published upstream
May 14, 2022
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Oct 27, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Oct 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."
Quoted source text, attributed separately from HOL analysis.