CVE-2026-56678 9Router: Kiro region injection allows authenticated SSRF with Authorization header forwarding
Authenticated attackers can exploit region injection to trigger SSRF and leak API keys via forwarded Authorization headers in 9Router.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56678?
CVE-2026-56678 is a medium-severity server-side request forgery vulnerability in decolua 9router, published on 15 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
9Router is an AI router & token saver. Prior to 0.5.6, the Kiro API-key validation endpoint POST /api/oauth/kiro/api-key builds an upstream URL using a user-controlled region value, allowing an authenticated attacker to supply a crafted region such as kiro-canary.local:8443# and cause 9Router to send the Kiro validation request to an attacker-controlled host while forwarding the submitted Kiro API key as an Authorization header. This issue is fixed in version 0.5.6.
Which versions are affected by CVE-2026-56678?
2 open source packages ship an affected version, including 9router.
| Package | Affected | Fixed in |
|---|---|---|
9router npm | All versions | 0.5.6 |
9router npm | All versions | 0.5.6 |
How do I fix CVE-2026-56678?
Upgrade 9router to 0.5.6 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-56678 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56678 exists.
Sources
Also known as GHSA-6mwv-4mrm-5p3m.