CVE-2026-493539Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING
- 7.5HighCVSS base score
- 0.34%Exploitation in 30 daysEPSS · top 73% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
Description
9Router is an AI router & token saver. In 0.4.45 and earlier, 9Router's src/dashboardGuard.js local-only access gate used Host and Origin headers in isLocalRequest() to protect /api/mcp/*, /api/tunnel/*, and /api/cli-tools/*, allowing header spoofing in reverse proxy or tunnel deployments to reach MCP child process stdin paths.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
- https://github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf (opens in a new tab)x_refsource_CONFIRMexploit
Timeline
ID reserved
By GitHub_M
- 47 days later
· 47 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.34% · top 73% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm9routerGHSA-6g2f-w7g3-77vf (opens in a new tab)
References
References4
- https://github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/decolua/9router/commit/5e1c1261368e06dced1cbc650684561b2c8844db (opens in a new tab)x_refsource_MISC
- https://github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919efb9970d1d5 (opens in a new tab)x_refsource_MISC
- https://github.com/decolua/9router/releases/tag/v0.4.46 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-44811 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-6g2f-w7g3-77vf (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-49353)Record last updated .