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First Malicious MCP in the Wild: The Postmark Backdoor That's Stealing Your Emails | Koi Blog

๐Ÿ“… September 28, 2025 ๐Ÿ“ฐ www.koi.security ๐Ÿ” 0 CVE(s) referenced

The first-ever malicious MCP server, postmark-mcp, silently exfiltrated thousands of sensitive emails from hundreds of organizations by adding a single backdoor lineโ€”exposing the massive, unchecked risk of trusting unvetted tools with god-mode permissions in AI-driven workflows.

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