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Filesystem Capability Laundering Vulnerabilities in MCP Servers

Filesystem Capability Laundering Vulnerabilities in MCP Servers

First seen 18 Oct 2026, 14:37 UTC • •
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ThreatCluster AI
ThreatCluster •October 18, 2026 at 15:40 UTC
  • •16.4% of analyzed MCP servers have filesystem capability laundering vulnerabilities.
  • •CVE-2026-103572 details a remote code execution flaw in Visual Studio Copilot.
  • •Research led to 13 security advisories, including two CVEs for Anthropic's MCP Server.

A recent study revealed that 16.4% of 4,806 analyzed MCP servers exhibit filesystem capability laundering vulnerabilities, allowing unauthorized access to sensitive files. This occurs when attacker-controlled arguments enable tools to bypass declared operational limits. The research identified 150 confirmed vulnerable instances and led to 13 security advisories, including two CVEs related to Anthropic's Git MCP Server. Additionally, a CVE (CVE-2026-103572) was published on 2026-10-13, detailing a remote code execution flaw in Visual Studio Copilot due to indirect prompt injection. The findings emphasize the need for improved security measures in MCP implementations to prevent exploitation.

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Timeline

2026-10-13
CVE-2026-103572 published
A remote code execution vulnerability in Visual Studio Copilot was disclosed, linked to indirect prompt injection.
Dev.To
2026-10-18
Study on MCP filesystem leaks published
A large-scale analysis revealed 16.4% of MCP servers are vulnerable to filesystem capability laundering, leading to multiple security advisories.
arxiv.org

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Common questions

What is filesystem capability laundering?
It is a vulnerability where attacker-controlled arguments allow tools to access sensitive files outside their declared operational limits.
How many MCP servers are affected?
The study found that 16.4% of the analyzed 4,806 MCP servers exhibit filesystem capability laundering vulnerabilities.
What should organizations do to mitigate this risk?
Organizations should review their MCP server configurations and implement stricter access controls to limit filesystem permissions.