---
title: "CVE-2026-49352: 9router's Hardcoded Default fallback JWT Secret  Allows Authentication Bypass"
url: https://erroneo.us/security/cve/CVE-2026-49352/
description: "CVE-2026-49352 (9router (npm)): 9Router is an AI router & token saver. From 0.2.21 until 0.4.44, 9Router used the hardcoded fallback JWT secret…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-15
date_modified: 2026-07-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-49352"
kev: false
cvss: 9.8
epss: 0.00601
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-49352: 9router's Hardcoded Default fallback JWT Secret  Allows Authentication Bypass

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 48: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 48% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes 9router (npm) >= 0.2.21, <= 0.4.41, fixed in 0.4.45 . Check your lockfile, including transitive dependencies.

## What it is

9Router is an AI router & token saver. From 0.2.21 until 0.4.44, 9Router used the hardcoded fallback JWT secret 9router-default-secret-change-me in src/app/api/auth/login/route.js, src/middleware.js, and later src/lib/auth/dashboardSession.js, allowing attackers to forge an authtoken cookie when JWTSECRET was unset. This issue is fixed in version 0.4.44

## Affected packages

- npm `9router` >= 0.2.21, <= 0.4.41 → fixed: 0.4.45

## Affected products (CVE record)

- decolua 9router: >= 0.2.21, < 0.4.44

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.60% probability of exploitation activity in the next 30 days; percentile 48.

## Sources

- [GitHub Advisory GHSA-jphh-m39h-6gwx](https://github.com/advisories/GHSA-jphh-m39h-6gwx)
- [CVE.org record CVE-2026-49352](https://www.cve.org/CVERecord?id=CVE-2026-49352)
- [NVD entry CVE-2026-49352](https://nvd.nist.gov/vuln/detail/CVE-2026-49352)
- [github.com](https://github.com/decolua/9router/security/advisories/GHSA-jphh-m39h-6gwx)
- [github.com](https://github.com/decolua/9router/commit/fe3ce25ae3cda48c0702c2d452e17f6ec214009d)
- [github.com](https://github.com/decolua/9router/releases/tag/v0.4.44)

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Source page: https://erroneo.us/security/cve/CVE-2026-49352/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt