CVE-2026-63732 9router before 0.4.60 Remote Code Execution via default password
Remote attackers can exploit hardcoded default credentials and header spoofing to register malicious plugins and execute arbitrary code on 9router servers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63732?
CVE-2026-63732 is a critical vulnerability in decolua 9router, published on 23 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-63732?
How do I fix CVE-2026-63732?
No fix has been published for CVE-2026-63732 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-63732 being exploited?
There is no known exploitation of CVE-2026-63732 in the wild and no public exploit code.
Sources
Also known as GHSA-qvg7-rqwf-6wmh.