CVE-2026-7730Public exploitNetwork attack vector

Authenticated command execution via non-generic framework bypass

Published May 4, 2026 · Updated May 4, 2026

OS command injection in privsim mcp-test-runner 0.2.0 allows remote authenticated users to execute OS commands through the run_tests MCP tool. For non-generic frameworks, src/index.ts passes the caller-controlled command to child_process.spawn with shell enabled, while validation is limited to the generic branch. Exploitation requires permission to invoke run_tests, and injected commands inherit the server process's filesystem and environment access.

CVSS severity6.3
Medium
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in privsim mcp-test-runner 0.2.0 allows remote authenticated users to execute OS commands through the run_tests MCP tool. For non-generic frameworks, src/index.ts passes the caller-controlled command to child_process.spawn with shell enabled, while validation is limited to the generic branch. Exploitation requires permission to invoke run_tests, and injected commands inherit the server process's filesystem and environment access.

The record

CVE
CVE-2026-7730
Published
May 4, 2026
Updated
May 4, 2026
Vendor
privsim
Product
mcp-test-runner
Classifications
CWE-77, CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 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=0.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

privsim · mcp-test-runnerversion=0.2.0

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 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-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS 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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