CVE-2026-63732

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-24. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.9Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity99% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

July 23, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

9router before 0.4.60 Remote Code Execution via default password | Advisories | VulnCheck

https://www.vulncheck.com/advisories/9router-before-remote-code-execution-via-default-password
github Patch Available🟡 PoC Available

Authenticated Remote Code Execution via Host Header Bypass and Unvalidated MCP Plugin Arguments · Advisory · decolua/9router · GitHub

https://github.com/decolua/9router/security/advisories/GHSA-4922-8r65-fq26

Vendor Advisories for CVE-2026-63732(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 45× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-30 02:00 UTCEG score recompute
  2. 2026-07-30 02:00 UTCGHSA enrichment
  3. 2026-07-30 01:30 UTCEPSS rescore
  4. 2026-07-30 01:30 UTCEPSS rescore
  5. 2026-07-29 21:47 UTCGHSA enrichment
  6. 2026-07-29 17:35 UTCGHSA enrichment
  7. 2026-07-29 13:25 UTCGHSA enrichment
  8. 2026-07-29 09:15 UTCGHSA enrichment
  9. 2026-07-29 05:04 UTCGHSA enrichment
  10. 2026-07-29 00:53 UTCGHSA enrichment
  11. 2026-07-28 20:42 UTCGHSA enrichment
  12. 2026-07-28 16:31 UTCEG score recompute
  13. 2026-07-28 16:31 UTCGHSA enrichment
  14. 2026-07-28 15:37 UTCEPSS rescore
  15. 2026-07-28 14:25 UTCGHSA enrichment
  16. 2026-07-28 10:13 UTCGHSA enrichment
  17. 2026-07-28 06:02 UTCGHSA enrichment
  18. 2026-07-28 01:52 UTCGHSA enrichment
  19. 2026-07-27 21:41 UTCGHSA enrichment
  20. 2026-07-27 17:20 UTCEG score recompute
  21. 2026-07-27 17:20 UTCGHSA enrichment
  22. 2026-07-27 17:02 UTCEG score recompute
  23. 2026-07-27 17:02 UTCGHSA enrichment
  24. 2026-07-27 15:07 UTCEG score recompute
  25. 2026-07-27 15:06 UTCGHSA enrichment
Show 20 more
  1. 2026-07-27 14:14 UTCEPSS rescore
  2. 2026-07-27 10:55 UTCGHSA enrichment
  3. 2026-07-27 06:45 UTCGHSA enrichment
  4. 2026-07-27 02:34 UTCGHSA enrichment
  5. 2026-07-26 22:22 UTCGHSA enrichment
  6. 2026-07-26 18:11 UTCEG score recompute
  7. 2026-07-26 18:11 UTCGHSA enrichment
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 14:54 UTCEPSS rescore
  10. 2026-07-26 13:54 UTCEG score recompute
  11. 2026-07-26 13:54 UTCGHSA enrichment
  12. 2026-07-26 09:44 UTCGHSA enrichment
  13. 2026-07-26 03:06 UTCEG score recompute
  14. 2026-07-26 03:06 UTCGHSA enrichment
  15. 2026-07-25 14:18 UTCEPSS rescore
  16. 2026-07-25 14:18 UTCEPSS rescore
  17. 2026-07-24 14:18 UTCEPSS rescore
  18. 2026-07-24 14:18 UTCEPSS rescore
  19. 2026-07-23 21:37 UTCEG score recompute
  20. 2026-07-23 21:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63732?
CVE-2026-63732 is a critical vulnerability published on July 23, 2026. 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 LOCALONLY network gate via a spoofed Host header, and unvalidated arguments passed to childprocess.spawn() when registering MCP…
When was CVE-2026-63732 disclosed?
CVE-2026-63732 was first published in the National Vulnerability Database on July 23, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63732 actively exploited?
CVE-2026-63732 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.0% of all scored CVEs.
What is the CVSS score of CVE-2026-63732?
CVE-2026-63732 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-63732?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63732, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-63732

Explore →

Is Your Infrastructure Affected by CVE-2026-63732?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs