---
title: "9router — CVE-2026-56675"
description: "An authentication bypass flaw affects the npm package 9router. Affected versions: <= 0.4.80. Fixed from version 0.5.2. CVSS score 8.3."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-23-cve-2026-56675
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-23
dateModified: 2026-09-23
---
# 9router — CVE-2026-56675

An authentication bypass flaw affects the npm package 9router. Affected versions: <= 0.4.80. Fixed from version 0.5.2. CVSS score 8.3.

## What to do

Update 9router to 0.5.2 or later.

| Fact | Value |
| --- | --- |
| Package | 9router |
| Ecosystem | npm (JavaScript) |
| Class | Authentication bypass |
| Affected versions | <= 0.4.80 |
| Fixed version | 0.5.2 |
| CVSS | 8.3 |
| CVE | CVE-2026-56675 |
| GHSA | GHSA-x5c9-v98j-722r |
| Published on | September 23, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-x5c9-v98j-722r](https://github.com/advisories/GHSA-x5c9-v98j-722r) — GitHub Security Advisories
- [NVD — CVE-2026-56675](https://nvd.nist.gov/vuln/detail/CVE-2026-56675) — NVD

---

Equivalent HTML page : https://inyourgeek.com/en/failles-de-securite/2026-09-23-cve-2026-56675
Published by InYourGeek — https://inyourgeek.com/en/a-propos
Method and safeguards : https://inyourgeek.com/en/methode
Full register : https://inyourgeek.com/en/failles-de-securite