CVE-2026-18482

Agent-mediated command execution via shell interpolation

Published Aug 20, 2026 · Updated Aug 20, 2026

Command injection in Neo.mjs before 88c77fc4 allows attackers to execute arbitrary OS commands via crafted absolutePath values. In ai/mcp/server/file-system/services/FileSystemService.mjs, the checkSyntax() and runPlaywrightTest() methods concatenate absolutePath into shell command strings for node --check and npx playwright test instead of passing it as a separate argv element. Reachability requires an AI agent or other caller to invoke those MCP tools with attacker-influenced input; execution then occurs with the host process's privileges rather than inside a jailed subprocess.

CVSS severityUnavailable
Unscored
EPSS probability1.65%
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 Neo.mjs before 88c77fc4 allows attackers to execute arbitrary OS commands via crafted absolutePath values. In ai/mcp/server/file-system/services/FileSystemService.mjs, the checkSyntax() and runPlaywrightTest() methods concatenate absolutePath into shell command strings for node --check and npx playwright test instead of passing it as a separate argv element. Reachability requires an AI agent or other caller to invoke those MCP tools with attacker-influenced input; execution then occurs with the host process's privileges rather than inside a jailed subprocess.

The record

CVE
CVE-2026-18482
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
Klarso GmbH
Product
Neo.mjs
Classifications
T1059.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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 <88c77fc4

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Klarso GmbH · Neo.mjsversion=0 <88c77fc4

Published CVSS scores

No CVSS assessment is available in this record.

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.

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No observations available

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

Weakness, pattern, technique

T1059.004Unix Shell

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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