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Wednesday, 28 October 2026
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Incident database

CVE-2026-49986: Cortex MCP Arbitrary Code Execution via Environment Variable

The Cortex MCP server prior to version 3.17.1 treats the CLAUDE_PROJECT_DIR environment variable as trusted, allowing attackers to execute arbitrary code by placing marker files in a malicious repository.

Disclosed 14 August 2026 · Record updated 1 October 2026

Impact

Arbitrary code execution with victim's local user process privileges when the open_visualization tool is invoked on a malicious repository.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-49986