---
title: "CVE-2026-56681: 9Router - Authentication Bypass"
description: "9Router prior to 0.5.6 contains an authentication bypass caused by trusting client-supplied X-9r-Real-Ip header in src/dashboardGuard.js, letting remote unauthenticated attackers access local API routes and consume resources, exploit requires bypassing API-key validation via header manipulation."
url: https://panop.io/threat-heartbeat/CVE-2026-56681/
---

# CVE-2026-56681 9Router - Authentication Bypass

9Router prior to 0.5.6 contains an authentication bypass caused by trusting client-supplied X-9r-Real-Ip header in src/dashboardGuard.js, letting remote unauthenticated attackers access local API routes and consume resources, exploit requires bypassing API-key validation via header manipulation.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.97% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-56681)

## Details

Type

Authentication Bypass

Impact

Broken Authentication, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-807](https://cwe.mitre.org/data/definitions/807.html)

## Vendor fix

Update to version 0.5.6 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-56681](https://nvd.nist.gov/vuln/detail/CVE-2026-56681)
- [https://github.com/decolua/9router/security/advisories/GHSA-5mj8-gf6m-fhw8](https://github.com/decolua/9router/security/advisories/GHSA-5mj8-gf6m-fhw8)
- [https://github.com/advisories/GHSA-5mj8-gf6m-fhw8](https://github.com/advisories/GHSA-5mj8-gf6m-fhw8)
- [https://github.com/decolua/9router/commit/efd20be8d81ef2e256a7037f3aa78e6b567b5fd3](https://github.com/decolua/9router/commit/efd20be8d81ef2e256a7037f3aa78e6b567b5fd3)
- [https://github.com/decolua/9router/releases/tag/v0.5.6](https://github.com/decolua/9router/releases/tag/v0.5.6)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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