CVE-2026-63732: critical vulnerability in decolua 9router
9router before 0.4.60 Remote Code Execution via default password
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.4epss 1.0%
9router 0.4.59 (fixed in 0.4.60) contains a chain of vulnerabilities: a hardcoded default password (123456) that authenticates any fresh installation, a bypass of the LOCAL_ONLY network gate via a spoofed Host header, and unvalidated arguments passed to child_process.spawn() when registering MCP plugins. A remote, unauthenticated attacker can log in with the default credential, spoof the Host header to reach local-only routes, and register a malicious MCP plugin (e.g. node -e <payload>) to achieve arbitrary code execution on the host operating system when the plugin's SSE endpoint is triggered.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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-2026-62312HIGH9Router: Authenticated RCE via Unvalidated MCP Plugin ArgumentsEPSS 0.9%CVE-2026-49352CRITICAL9Router: Hardcoded Default fallback JWT Secret Allows Authentication BypassEPSS 0.6%