CVE-2026-55638 | THREATINT

Description

9Router is an AI router & token saver. Prior to 0.5.2, 9router protects /v1, /v1beta, /api/v1, and /api/v1beta in src/dashboardGuard.js but omits /codex before next.config.mjs rewrites /codex/* to /api/v1/responses. A remote unauthenticated attacker can send requests to /codex/* to bypass the API-key gate and cause the server to make upstream provider calls using operator-stored LLM provider credentials. This issue is fixed in version 0.5.2.

PUBLISHED Reserved 2026-06-16 | Published 2026-07-10 | Updated 2026-07-10 | Assigner GitHub_M

HIGH: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Problem types

CWE-862: Missing Authorization

CWE-863: Incorrect Authorization

Product status

< 0.5.2

affected

References

github.com/...router/security/advisories/GHSA-8gmq-j984-vp4r exploit

github.com/...router/security/advisories/GHSA-8gmq-j984-vp4r

github.com/...ommit/b282f0554972ea35281520738759d76abcd0b0b3

github.com/decolua/9router/releases/tag/v0.5.2

cve.org (CVE-2026-55638)

nvd.nist.gov (CVE-2026-55638)

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