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Vulnerability record · CVE-2026-56675 · published 10 July 2026

CVE-2026-56675: Improper authentication vulnerability

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.

8.3 CVSS 3.1 High EPSS 0.50% · top 59.5% CWE-287 · Improper authenticationCWE-290 · Authentication bypass by spoofing Deferred
8.3CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
10 Jul 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279dc
https://github.com/decolua/9router/releases/tag/v0.5.2
https://github.com/decolua/9router/security/advisories/GHSA-x5c9-v98j-722r

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Source: NIST National Vulnerability Database (record CVE-2026-56675), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.