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2.1

ACE-MCP lets attackers read arbitrary files

CVE-2026-94046 · published 29 days ago
Summary

The ACE-MCP tool (versions up to 4.10.8) can be tricked into opening files outside the intended project folder. By giving a crafted path, an attacker could view system files such as /etc/hosts. Update to a patched version or restrict the tool so it only uses trusted directories and validates all paths before accessing files.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
0215andrewfeng ace-mcp 4.10.0
Original advisory text
0215AndrewFeng ACE-MCP MCP Tool getFileSnippet.ts get_file_snippet path traversal
A weakness has been identified in 0215AndrewFeng ACE-MCP up to 4.10.8. The affected element is the function get_file_snippet of the file getFileSnippet.ts of the component MCP Tool. Executing a manipulation of the argument projectRootPath/filePath can lead to path traversal. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. isPathInsideProjectRoot only blocks filePath escaping the attacker-chosen projectRootPath; the root itself is untrusted client input - set projectRootPath=/etc, filePath=hosts and the guard passes. The project was informed of the problem early through an issue report but has not responded yet.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
2.1 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-22Path Traversal
Timeline
Published20 Sep 2026
Updated19 Oct 2026
First seen20 Sep 2026
Sources
CVE-2026-94046 · NVD
CVE-2026-94046 · MITRE
CVE-2026-94046 · OSV
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