CVE-2026-44450

Critical

Published: 26 May 2026

Published

26 May 2026

Modified

27 May 2026

KEV Added

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Patch

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CVSS Score v3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Score 0.0038 29.6th percentile

Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-44450 is a critical-severity Argument Injection (CWE-88) vulnerability. Its CVSS base score is 9.9 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 29.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

This vulnerability is AI-related — categorised as LLM Application Platforms; in the Protocol-Specific Risks risk domain.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-31978

Vulnerability details

Lumiverse is a full-featured AI chat application. Prior to 0.9.7, the MCP server creation endpoint validates the command field against an allowlist of binary names but forwards the args array to the child process without any validation. Every binary on…

the allowlist accepts an inline-code execution flag (-e for node/bun, -c for python3/deno), giving any logged-in user arbitrary OS-level code execution on the Lumiverse server. The route requires only requireAuth (not requireOwner). The server binds on all interfaces (::) and the host-header rebinding check is bypassed trivially by any HTTP client that sends Host: localhost:<port> directly, making this exploitable from any machine with network access to the server port. This vulnerability is fixed in 0.9.7.

CWE(s): CWE-88

AI Security AnalysisAI

AI Category: LLM Application Platforms
Risk Domain: Protocol-Specific Risks
OWASP Top 10 for LLMs 2025: None mapped
Classification Reason: Matched keywords: ai, mcp

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059 Command and Scripting Interpreter Execution

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.

attack.mitre.org →

Why these techniques?

CWE-88 argument injection in public-facing MCP endpoint allows any authenticated user to pass code-execution flags (-e/-c) to allowlisted interpreters, directly enabling remote code execution via T1190 and T1059.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0