by Kastro
Paper/Archive/CVE-2026-63732

CVE-2026-63732

decolua 9router — 9router before 0.4.60 Remote Code Execution via default password

EPSS 1%CVSS 9.9
critical.is priorityof 100
42
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 63.2.632 × 2012.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
9router< 0.4.600.4.60CNA

Scores by source

VulnCheck (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
VulnCheck (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorygithub.com/decolua/9router/security/advisories/GHSA-4922-8r65-fq26writeupvulncheck.com/advisories/9router-before-remote-code-execution-via-default-password