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

8.7HIGH

Key Information:

Vendor

Agenticmail

Status
Agenticmail
Vendor
CVE Published:
12 June 2026

What is CVE-2026-50287?

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 Version(s)

agenticmail < 0.9.27

References

https://github.com/agenticmail/agenticmail/security/advis...
x_refsource_CONFIRM

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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