Auth bypass in Decolua 9router
CVE-2026-59801
9Router through version 0.4.41 contains an unauthenticated access vulnerability that allows remote attackers to interact with provider management API endpoints by sending requests without any credentials due to missing authentication middleware in the Next.js API routes under src/app/api/providers/*. Attackers can enumerate, create, modify, or delete provider connections to expose partial credentials, OAuth tokens, and API keys, redirect AI traffic to attacker-controlled servers, or cause complete denial of service by deleting all provider connections.
Vulnerability class: Broken Authentication
EPSS: 0.029 (86.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Decolua 9router — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-59801?
- CVE-2026-59801 is a critical-severity vulnerability in Decolua 9router, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-07-13.
- How severe is CVE-2026-59801?
- Critical severity. CVSS v3 base score is 9.8 out of 10.