CVE-2026-56677
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
9Router in 0.5.4 and earlier does not restrict the issuerUrl parameter in the POST /api/auth/oidc/test endpoint, allowing unauthenticated attackers (when dashboard login is disabled) to scan internal services and reflect OIDC discovery fields including token_endpoint and jwks_uri.
Risk Assessment
An attacker can gain information about internal infrastructure and potentially use it for further attacks, such as token interception.
Recommendation
Update 9Router to a patched version and restrict access to the test endpoint.
Original NVD description (English source)
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.