CVE-2026-56675CWE-287CWE-290CWE-306CWE-441

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

High · published July 10, 2026

CVSS v3.1
8.3
EPSS
1%
Percentile
42.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00501 · 42.1th percentile
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')
Published
2026-07-10T15:39Z
EPSS history
Timeline
  • 10 JUL 15:39Z
    9router: Reverse proxy locality collapse allows unauthenticated access to 9router /v1 APIs
    cvelistv5