CVE-2026-56682 9Router: Login Brute-Force Lockout Bypass via Spoofable X-9r-Real-Ip Header
Attackers can bypass login lockout mechanisms by spoofing IP headers, enabling unthrottled password guessing and potential administrative account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56682?
CVE-2026-56682 is a medium-severity vulnerability in decolua 9router, published on 22 Sep 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. Prior to 0.5.6, 9Router deployments that allow requests to reach Next.js without the sanitizing custom-server.js wrapper use the client-supplied X-9r-Real-Ip value as the bucket key in getClientIp, checkLock, and recordFail in src/lib/auth/loginLimiter.js for POST /api/auth/login. A remote unauthenticated attacker can rotate the header on every password guess so each request uses a new failed-attempt bucket and the five-attempt progressive lockout never returns HTTP 429. This permits unthrottled password guessing against the dashboard login and can lead to an administrative session if the password is recovered. This issue is fixed in version 0.5.6.
Which versions are affected by CVE-2026-56682?
2 open source packages ship an affected version, including 9router.
| Package | Affected | Fixed in |
|---|---|---|
9router npm | All versions | 0.5.8 |
9router npm | All versions | 0.5.8 |
How do I fix CVE-2026-56682?
Upgrade 9router to 0.5.8 or later.
Is CVE-2026-56682 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56682 exists.
Sources
Also known as GHSA-32gc-64m7-hj7v.