Auth bypass in Decolua 9router
CVE-2026-56677
9Router is an AI router & token saver. In 0.5.4 and earlier, the POST /api/auth/oidc/test endpoint in src/app/api/auth/oidc/test/route.js passes the user-controlled issuerUrl parameter to fetchOidcDiscovery() in src/lib/auth/oidc.js without restricting private or loopback destinations, allowing unauthenticated attackers when dashboard login is disabled to scan internal services and reflect OIDC discovery fields including token_endpoint and jwks_uri.
Vulnerability class: Broken Authentication
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L.
Affected products
- Decolua 9router — versions <= 0.5.4
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-56677?
- CVE-2026-56677 is a high-severity vulnerability in Decolua 9router, classified under Missing Authentication for Critical Function. CVSS score: 8.6/10. Published 2026-08-17.
- How severe is CVE-2026-56677?
- High severity. CVSS v3 base score is 8.6 out of 10.