Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-493529Router: Hardcoded Default fallback JWT Secret Allows Authentication Bypass

Critical 9.8

In plain English

A critical-severity hard-coded credentials in 9router from decolua. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.6%top 51.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

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 auth_token cookie when JWT_SECRET was unset. This issue is fixed in version 0.4.44

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	9router	0.4.45	GHSA-jphh-m39h-6gwx

Affected products (as reported)

Vendor	Product	Versions
decolua	9router	>= 0.2.21, < 0.4.44

Weakness: CWE-798 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/decolua/9router/security/advisories/GHSA-jphh-m39h-6gwx x_refsource_CONFIRM
https://github.com/decolua/9router/commit/fe3ce25ae3cda48c0702c2d452e17f6ec214009d x_refsource_MISC
https://github.com/decolua/9router/releases/tag/v0.4.44 x_refsource_MISC