CVE-2026-3680Public exploitNetwork attack vector

Authenticated command execution via shell-concatenated paths

Published Mar 7, 2026 · Updated Mar 7, 2026

Command injection in Ryuzaki Shinji Biome MCP Server 1.0.0 allows remote authenticated users to execute host commands through MCP tools. The biome-lint and biome-format handlers concatenate paths and configPath into command strings passed to child_process.exec, allowing shell metacharacters to create additional commands. Access to invoke either MCP tool is required, and injected commands run with the operating-system privileges of the server process.

CVSS severity6.3
Medium
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Ryuzaki Shinji Biome MCP Server 1.0.0 allows remote authenticated users to execute host commands through MCP tools. The biome-lint and biome-format handlers concatenate paths and configPath into command strings passed to child_process.exec, allowing shell metacharacters to create additional commands. Access to invoke either MCP tool is required, and injected commands run with the operating-system privileges of the server process.

The record

CVE
CVE-2026-3680
Published
Mar 7, 2026
Updated
Mar 7, 2026
Vendor
Ryuzaki Shinji
Product
Biome MCP Server
Classifications
CWE-74, CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ryuzaki Shinji · Biome MCP Serverversion=1.0

Published CVSS scores

2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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