CVE-2026-49352: 9Router: Hardcoded Default fallback JWT Secret Allows Authentication Bypass

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-15 · updated 2026-10-24
Weakness: CWE-798

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 products

decolua 9router: from 0.2.21, < 0.4.44

References

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

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