CVE-2026-44450Public exploitNetwork attack vector

Authenticated code execution via MCP stdio arguments

Published May 26, 2026 · Updated May 26, 2026

Argument injection in Lumiverse before 0.9.7 allows remote authenticated users to execute code through crafted MCP stdio arguments. The MCP server creation path allowlists the command basename but passes its args array unchanged to a child process, including inline-code flags. Any logged-in user with network access to the server port can execute code with the Lumiverse server process's operating-system permissions.

CVSS severity9.9
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in Lumiverse before 0.9.7 allows remote authenticated users to execute code through crafted MCP stdio arguments. The MCP server creation path allowlists the command basename but passes its args array unchanged to a child process, including inline-code flags. Any logged-in user with network access to the server port can execute code with the Lumiverse server process's operating-system permissions.

The record

CVE
CVE-2026-44450
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Prolix OCs
Product
Lumiverse
Classifications
CWE-88, CAPEC-174, CAPEC-460, CAPEC-41, CAPEC-137, CAPEC-88, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 0.9.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Prolix OCs · Lumiverseversion=< 0.9.7

Published CVSS scores

9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CAPEC-174Flash Parameter Injection
CAPEC-460HTTP Parameter Pollution (HPP)
CAPEC-41Using Meta-characters in E-mail Headers to Inject Malicious Payloads
CAPEC-137Parameter Injection
CAPEC-88OS 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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