HighVulnerability

CVE-2026-50287: AgenticMail MCP server missing authentication on HTTP /mcp endpoint

Source: NVD(opens in a new tab)
Identifier: CVE-2026-50287
Published: June 12, 2026
Record updated: October 9, 2026

Affected: @agenticmail/mcp < 0.9.27
Fixed in: 0.9.27
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.5%

Summary

CVE-2026-50287 affects @agenticmail/mcp before version 0.9.27 when started with --http or MCP_HTTP=1, which enables a Streamable HTTP transport. The /mcp endpoint accepts requests without any HTTP authentication layer, so a remote client can initialize a session and call tools directly. GitHub, Inc. rates it CVSS-B 8.7 HIGH (CVSS:4.0), with high confidentiality impact and no privileges or user interaction required.

Mitigation

Fixed in version 0.9.27.

Details

Scores and exploitation

Patch available: Yes
EPSS: 0.5%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 24, 2026.
Disclosure date: June 12, 2026

Weaknesses and techniques

Weakness (CWE): CWE-306
Attack pattern (CAPEC): CAPEC-115

Affected

Packages: @agenticmail/mcp@< 0.9.27 (fixed: 0.9.27)

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Agent
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-50287

First tracked: June 12, 2026 at 08:09 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Topics

AI agents

Summary

Mitigation

Topics

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