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 trust the client-supplied X-9r-Real-Ip header in src/dashboardGuard.js when isLocalRequest decides whether canAccessPublicLlmApi may skip API-key validation for /api/v1/* routes. A remote unauthenticated attacker can set X-9r-Real-Ip to 127.0.0.1 and be classified as a local client, including on the verified GET /api/v1/models route. This permits unauthorized use of the instance owner's configured LLM providers, consumption of paid credits, and enumeration of configured providers and models. This issue is fixed in version 0.5.6.
History

Mon, 28 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 22 Sep 2026 18:15:00 +0000

Type Values Removed Values Added
First Time appeared Decolua
Decolua 9router
Vendors & Products Decolua
Decolua 9router

Tue, 22 Sep 2026 16:15:00 +0000

Type Values Removed Values Added
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 trust the client-supplied X-9r-Real-Ip header in src/dashboardGuard.js when isLocalRequest decides whether canAccessPublicLlmApi may skip API-key validation for /api/v1/* routes. A remote unauthenticated attacker can set X-9r-Real-Ip to 127.0.0.1 and be classified as a local client, including on the verified GET /api/v1/models route. This permits unauthorized use of the instance owner's configured LLM providers, consumption of paid credits, and enumeration of configured providers and models. This issue is fixed in version 0.5.6.
Title 9Router: Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip Header
Weaknesses CWE-807
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-22T16:02:25.018Z

Updated: 2026-09-28T19:31:54.707Z

Reserved: 2026-06-22T16:39:01.044Z

Link: CVE-2026-56681

cve-icon Vulnrichment

Updated: 2026-09-28T19:31:20.753Z

cve-icon NVD

Status : Deferred

Published: 2026-09-22T16:17:48.350

Modified: 2026-09-28T20:17:10.540

Link: CVE-2026-56681

cve-icon Redhat

No data.