# CVE-2026-63732 — decolua 9router

> As of 2026-07-23, CVE-2026-63732 is a CRITICAL-severity vulnerability in decolua 9router, CVSS v3.1 9.9, EPSS 0.7% (50.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-63732 as of 2026-07-23; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-23

## What is 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 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 ) to achieve arbitrary code execution on the host operating system when the plugin's SSE endpoint is triggered.

The record classifies CVE-2026-63732 under weakness class [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 74 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.9 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 9.4 (`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`)
- **EPSS (FIRST):** 0.7% probability of exploitation in the next 30 days, higher than 50.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-23

## Is CVE-2026-63732 being exploited?

It currently carries a trending score of 42 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **decolua**: 9router

## How to fix CVE-2026-63732

No vendor patch reference has been recorded for CVE-2026-63732 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-63732

No threat campaign in the Threadlinqs corpus currently references CVE-2026-63732, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-07-26. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/decolua/9router/security/advisories/GHSA-4922-8r65-fq26)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/9router-before-remote-code-execution-via-default-password)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-63732
Full detection coverage and IOCs for threats exploiting CVE-2026-63732 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp