What’s Vulnerable › Vulnerabilities

CVE-2026-55638: 9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-862

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.

Affected products

• decolua 9router: before 0.5.2

References

• https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3
• https://github.com/decolua/9router/releases/tag/v0.5.2
• https://github.com/decolua/9router/security/advisories/GHSA-8gmq-j984-vp4r
• https://github.com/decolua/9router/security/advisories/GHSA-8gmq-j984-vp4r

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