9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass

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Summary

CVECVE-2026-55638
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 17:16:59 UTC
Updated2026-07-10 17:35:11 UTC
Description9Router 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

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

Problem Types: CWE-862 | CWE-863 | CWE-862 CWE-862: Missing Authorization | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Decolua 9router affected < 0.5.2 Not specified

References

ReferenceSourceLinkTags
github.com/decolua/9router/security/advisories/GHSA-8gmq-j984-vp4r 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/decolua/9router/releases/tag/v0.5.2 [email protected] github.com
github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3 [email protected] github.com
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