CVE-2026-50287

Missing Authentication for Critical Function in @agenticmail/mcp

HIGH

8.7

CVSS Score

Published: June 12, 2026 at 06:44 PM UTC

Updated: June 17, 2026 at 10:57 AM UTC

1 product affected across 1 vendorAgenticMail

Using agenticmail by agenticmail?

Get instant alerts when new vulnerabilities affect agenticmail - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH8.7

Exploit prediction

EPSS 0.4%

SSVC

PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

AgenticMail · Agenticmail

50%

v < 0.9.27

Affected range stops below 0.9.27, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM

Source: cverecord

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

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-306

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card