CVE-2026-50287: Missing Authentication for Critical Function in @agenticmail/mcp

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-12 · updated 2026-06-17
Weakness: CWE-306

Description

AgenticMail gives AI agents real email addresses and phone numbers. Prior to version 0.9.27, @agenticmail/mcp exposes a Streamable HTTP transport when started with --http or MCP_HTTP=1. In that mode, the /mcp endpoint accepts requests without any HTTP authentication layer. A remote client can initialize a session and call tools directly. This issue has been patched in version 0.9.27.

Affected products

agenticmail: before 0.9.27

References

https://github.com/agenticmail/agenticmail/security/advisories/GHSA-63gr-g7jc-v8rg
https://github.com/agenticmail/agenticmail/security/advisories/GHSA-63gr-g7jc-v8rg

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