PT-2026-50897 · Dtwang · Line-Desktop-Mcp

Published 2026-06-19 · Updated 2026-06-19 · CVE-2026-49357

Mitre

CVSS v4.0

8.8

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Line Desktop MCP is a project that, while unaffiliated with the official line-bot-mcp-server, allows users to directly operate the LINE Desktop application on Windows or Mac via MCP. line-desktop-mcp supports a --http-mode Streamable HTTP transport for use with clients such as n8n. In this mode the server binds to 0.0.0.0 and exposes the MCP /mcp endpoint without an MCP-layer authentication check. Prior to version 1.1.2, any network client that can reach the port can initialize a session, list tools, and call tools that read LINE Desktop chat history or send LINE messages through the already logged-in desktop application. Version 1.1.2 fixes the issue.

Fix

Missing Authentication

Missing Authorization

Weakness Enumeration

CWE-306

CWE-862

Related Identifiers

CVE-2026-49357

Affected Products

Line-Desktop-Mcp

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-49357 · Security Note
• https://github.com/dtwang/line-desktop-mcp/commit/680617894981ea93f8f6ceb51ecde7519754d501 · Note
• https://github.com/dtwang/line-desktop-mcp/security/advisories/GHSA-4hf8-5mjm-rfgq · Note