CVE-2026-46339: critical vulnerability in decolua 9router
9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes
Published · Updated
63Vexday Risk Score
Patch soon. It has a working public exploit.
ssvc Attendcvss 10epss 3.4%
from disclosure to weapon44 days
Published on NVDJul 15
1st PoC+44d
exploitation probability
3.4%top 11% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
9Router is an AI router & token saver. From 0.4.30 until 0.4.37, 9Router's src/proxy.js middleware did not protect /api/cli-tools/* and /api/mcp/*, allowing unauthenticated registration of customPlugins through src/app/api/cli-tools/cowork-settings/route.js and command execution through the MCP bridge. This vulnerability is fixed in 0.4.37.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products
decolua · 9routerpublic PoCs found — 1
githubgithub.com/SimoesCTT/CTT-Enhanced-CVE-2026-46339-Exploit-Engine★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — decolua 9router
In the same product, most dangerous first.
CVE-2026-59800CRITICAL9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install EndpointEPSS 2.0%CVE-2026-62312HIGH9Router: Authenticated RCE via Unvalidated MCP Plugin ArgumentsEPSS 1.3%CVE-2026-63732CRITICAL9router before 0.4.60 Remote Code Execution via default passwordEPSS 1.0%CVE-2026-56681HIGH9Router: Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip HeaderEPSS 1.0%CVE-2026-55500CRITICAL9router: Exposure of Sensitive Information and Unprotected Database Import/Export Allows Complete Credential Theft and Database TakeoverEPSS 0.7%CVE-2026-55638HIGH9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypassEPSS 0.6%