{"cve":"CVE-2026-56681","nvd":{"published":"2026-09-22T16:17:48.350","modified":"2026-09-28T20:17:10.540","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","score":7.3},"cwes":["CWE-807"],"references":["https://github.com/decolua/9router/commit/efd20be8d81ef2e256a7037f3aa78e6b567b5fd3","https://github.com/decolua/9router/releases/tag/v0.5.6","https://github.com/decolua/9router/security/advisories/GHSA-5mj8-gf6m-fhw8","https://github.com/decolua/9router/security/advisories/GHSA-5mj8-gf6m-fhw8"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-56681","score":0.01114,"percentile":0.66024,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-5mj8-gf6m-fhw8","url":"https://osv.dev/vulnerability/GHSA-5mj8-gf6m-fhw8","summary":"9Router has an Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip Header","modified":"2026-09-22T17:15:10.402561848Z","packages":[{"ecosystem":"npm","name":"9router","purl":"pkg:npm/9router","ranges":["<0.5.8"],"fixed":["0.5.8"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}