CVE-2026-15749Public exploit

Local file disclosure via unvalidated C2d path

Published Jul 14, 2026 · Updated Jul 14, 2026

Path traversal in MasterGo Magic MCP 0.1 through 0.2.0 allows local users to read process-accessible files via mcp__C2d. The execute function passes the caller-controlled filePath directly to fs.readFileSync without canonicalization or a directory-boundary check, then posts the file body to MasterGo's postC2d endpoint. An MCP client or prompt-injected agent must be able to invoke the local stdio tool; disclosure is limited to files readable by the service account.

CVSS severity5.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in MasterGo Magic MCP 0.1 through 0.2.0 allows local users to read process-accessible files via mcp__C2d. The execute function passes the caller-controlled filePath directly to fs.readFileSync without canonicalization or a directory-boundary check, then posts the file body to MasterGo's postC2d endpoint. An MCP client or prompt-injected agent must be able to invoke the local stdio tool; disclosure is limited to files readable by the service account.

The record

CVE
CVE-2026-15749
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
MasterGo
Product
MasterGo Magic MCP
Classifications
CWE-22, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=0.1
  2. Affected versionversion=0.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

MasterGo · MasterGo Magic MCPversion=0.1; version=0.2.0

Published CVSS scores

4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

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

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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