CVE-2026-63732: 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 ne

criticalCVSS 9.9CVE-2026-63732

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: critical — CVSS 9.9
Published: 2026-07-23
Last updated: 2026-07-28
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-63732

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-637320.74% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-63732	coverage & exploitation status	NVD · CVE.org

Recent advisories for 9router

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-63313: 9Router before 0.4.72 contains a server-side request forgery (SSRF) vulnerability in the /v1/w…nvd · 2026-07-23
highCVE-2026-62312: 9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated a…nvd · 2026-07-15
unknownCVE-2026-56679: 9Router is an AI router & token saver. Prior to 0.5.4, the PATCH /api/settings endpoint writes…nvd · 2026-07-15
mediumCVE-2026-56678: 9Router is an AI router & token saver. Prior to 0.5.6, the Kiro API-key validation endpoint PO…nvd · 2026-07-15
highCVE-2026-49353: 9Router is an AI router & token saver. In 0.4.45 and earlier, 9Router's src/dashboardGuard.js …nvd · 2026-07-15
criticalCVE-2026-49352: 9Router is an AI router & token saver. From 0.2.21 until 0.4.44, 9Router used the hardcoded fa…nvd · 2026-07-15

CVE-2026-63732: 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 ne

Details

Exploitation outlook

Referenced CVEs

Recent advisories for 9router

More from NVD Recent CVEs