CVE-2026-56677 9Router: Authenticated Server-Side Request Forgery (SSRF) via OIDC Provider Test Endpoint
Attackers can exploit an SSRF vulnerability in the OIDC test endpoint to scan internal services and access sensitive data when dashboard login is disabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56677?
CVE-2026-56677 is a high-severity server-side request forgery vulnerability in decolua 9router, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-56677?
2 open source packages ship an affected version, including 9router.
| Package | Affected | Fixed in |
|---|---|---|
9router npm | All versions to 0.5.4 | None |
9router npm | All versions to 0.5.4 | None |
How do I fix CVE-2026-56677?
No fix has been published for CVE-2026-56677 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-56677 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56677 exists.
Sources
Also known as GHSA-8g4w-4ffg-8vgx.