Vulnerability-Lookup

GHSA-CMG9-62Q9-XMWW

Vulnerability from github – Published: 2026-08-20 15:34 – Updated: 2026-08-20 21:31

Details

Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS command execution when an AI agent is induced to invoke these tools. Commit 88c77fc fixes these vulnerabilities.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-18482"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-20T13:16:58Z",
    "severity": null
  },
  "details": "Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS command execution when an AI agent is induced to invoke these tools. Commit 88c77fc fixes these vulnerabilities.",
  "id": "GHSA-cmg9-62q9-xmww",
  "modified": "2026-08-20T21:31:26Z",
  "published": "2026-08-20T15:34:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18482"
    },
    {
      "type": "WEB",
      "url": "https://github.com/neomjs/neo/commit/5acc564ea1b278bca5fab1f8f397a6ba9b849d75"
    },
    {
      "type": "WEB",
      "url": "https://github.com/neomjs/neo/commit/88c77fc4"
    },
    {
      "type": "WEB",
      "url": "https://novice-22.com/posts/cve-2026-18482-neo.mjs"
    },
    {
      "type": "WEB",
      "url": "https://novice-22.com/posts/neo-mjs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-18482 (GCVE-0-2026-18482)

Vulnerability from cvelistv5 – Published: 2026-08-20 12:36 – Updated: 2026-08-20 19:16

Title

CVE-2026-18482

Summary

Severity

No CVSS data available.

CWE

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

Assigner

certcc mitre root

References

3 references

URL	Tags
https://github.com/neomjs/neo/commit/5acc564ea1b2…
https://github.com/neomjs/neo/commit/88c77fc4
https://novice-22.com/posts/neo-mjs/

Impacted products

1 product

Vendor	Product	Version
Klarso GmbH	neo-mjs	Affected: 0 , < 88c77fc4 (custom)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "neo-mjs",
          "vendor": "Klarso GmbH",
          "versions": [
            {
              "lessThan": "88c77fc4",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS command execution when an AI agent is induced to invoke these tools. Commit 88c77fc fixes these vulnerabilities."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-78 Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-20T19:16:46.108Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://github.com/neomjs/neo/commit/5acc564ea1b278bca5fab1f8f397a6ba9b849d75"
        },
        {
          "url": "https://github.com/neomjs/neo/commit/88c77fc4"
        },
        {
          "url": "https://novice-22.com/posts/neo-mjs/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CVE-2026-18482",
      "x_generator": {
        "engine": "VINCE 3.0.44",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-18482"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2026-18482",
    "datePublished": "2026-08-20T12:36:40.567Z",
    "dateReserved": "2026-07-31T12:46:16.513Z",
    "dateUpdated": "2026-08-20T19:16:46.108Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-CMG9-62Q9-XMWW

CVE-2026-18482 (GCVE-0-2026-18482)

Tags

Sightings

Nomenclature