CVE-2026-56681: 9Router: Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip Header
decolua · 9router
Affected: decolua 9router · Exploitation: check available, not yet exploited
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 66% of scored CVEs
DescriptionCVE.org
9Router is an AI router & token saver. Prior to 0.5.6, 9Router deployments that allow requests to reach Next.js without the sanitizing custom-server.js wrapper trust the client-supplied X-9r-Real-Ip header in src/dashboardGuard.js when isLocalRequest decides whether canAccessPublicLlmApi may skip API-key validation for /api/v1/* routes. A remote unauthenticated attacker can set X-9r-Real-Ip to 127.0.0.1 and be classified as a local client, including on the verified GET /api/v1/models route. This permits unauthorized use of the instance owner's configured LLM providers, consumption of paid credits, and enumeration of configured providers and models. This issue is fixed in version 0.5.6.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- decolua · 9router< 0.5.6
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
- CISA KEV
- Not listed
- Public check
- 9router <=0.5.4 - Authentication Bypass · nuclei template in projectdiscovery/nuclei-templates
- Vendor
- decolua
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-56681 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.