CVE-2026-56675

9router: Reverse proxy locality collapse allows unauthenticated access to 9router /v1 APIs

State: Published
Severity: 8.3 High
Published: Jul 10, 2026
Updated: Jul 10, 2026
Reserved: Jun 22, 2026

Description

9Router is an AI router & token saver. Prior to 0.5.2, 9router treats loopback requests as trusted and allows /v1/* access without an API key, so a same-host reverse proxy that forwards public traffic to the backend through 127.0.0.1 causes src/dashboardGuard.js to misclassify external requests as local. A remote unauthenticated attacker can access /v1 APIs such as /v1/models and may abuse configured upstream provider credentials through /v1 proxy endpoints depending on enabled providers. This issue is fixed in version 0.5.2.

Scores

CVSS	Score	Vector	Source
3.1	8.3 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L	GitHub_M

Weaknesses

CWE-287 Improper Authentication
CWE-290 Authentication Bypass by Spoofing
CWE-306 Missing Authentication for Critical Function
CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')

Affected Products

Product	Versions
9routerdecolua	< 0.5.2Affected

References

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