CVE-2026-50287 PUBLISHED

Missing Authentication for Critical Function in @agenticmail/mcp

Assigner: GitHub_M
Reserved: 04.06.2026 Published: 12.06.2026 Updated: 12.06.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	agenticmail
Product	agenticmail
Versions	Version < 0.9.27 is affected

References

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

Problem Types

CWE-306: Missing Authentication for Critical Function CWE