MSRXCVE-2026-56682
CVE-2026-56682
9Router: Login Brute-Force Lockout Bypass via Spoofable X-9r-Real-Ip Header
CVSS 3.1 · CNA · github.com
chance of exploitation in the next 30 days (EPSS; higher than 42% of CVEs)
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.
Scores
Affected packages and fixed versions
| Package | Ecosystem | Fixed in |
|---|---|---|
| 9router | npm | 0.5.8 |
Affected products
- decolua 9router: < 0.5.6
Also known as: GHSA-32gc-64m7-hj7v
3 references (advisories, patches, write-ups)
Sources: NVD, CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.