9Router: Login Brute-Force Lockout Bypass via Spoofable X-9r-Real-Ip Header

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-56682
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-22 17:17:24 UTC
Updated2026-09-22 18:17:15 UTC
Description9Router 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.004990000 probability, percentile 0.418240000 (date 2026-09-23)

Problem Types: CWE-307 | CWE-807 | CWE-307 CWE-307: Improper Restriction of Excessive Authentication Attempts | CWE-807 CWE-807: Reliance on Untrusted Inputs in a Security Decision

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Decolua 9router affected < 0.5.6 Not specified

References

ReferenceSourceLinkTags
github.com/decolua/9router/releases/tag/v0.5.6 [email protected] github.com
github.com/decolua/9router/commit/efd20be8d81ef2e256a7037f3aa78e6b567b5fd3 [email protected] github.com
github.com/decolua/9router/security/advisories/GHSA-32gc-64m7-hj7v 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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