CVE-2026-62312: high-severity vulnerability in decolua 9router
9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.9%
9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
decolua · 9routerRelated CVEs — decolua 9router
In the same product, most dangerous first.
CVE-2026-55638HIGH9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypassEPSS 6.6%CVE-2026-46339CRITICAL9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routesEPSS 2.8%CVE-2026-59800CRITICAL9Router < 0.4.44 - OS Command Injection via sudoPassword Parameter in Tailscale Install EndpointEPSS 2.1%CVE-2026-56681HIGH9Router: Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip HeaderEPSS 1.1%CVE-2026-63732CRITICAL9router before 0.4.60 Remote Code Execution via default passwordEPSS 1.0%CVE-2026-49352CRITICAL9Router: Hardcoded Default fallback JWT Secret Allows Authentication BypassEPSS 0.6%