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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

mcp-shell Multiple Command Execution Vulnerabilities

Three vulnerabilities in mcp-shell prior to version 0.6.0 allow attackers to execute arbitrary OS commands through the shell_exec MCP tool due to insecure default configuration, insufficient command validation, and shell metacharacter bypass in Git alias handling.

Disclosed 25 August 2026 · Record updated 13 September 2026

Impact

An attacker with MCP connectivity can execute unrestricted OS commands as the mcp-shell process user in default deployments, including Docker containers running as mcpuser.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-55580
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-55581
  3. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-55582