CVE-2026-49357 (GCVE-0-2026-49357)

Vulnerability from cvelistv5 – Published: 2026-06-19 13:11 – Updated: 2026-06-22 17:15
VLAI
Title
Streamable HTTP mode exposes LINE Desktop read/send tools without MCP authentication
Summary
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.
Severity
8.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-22 15:48 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-862 - Missing Authorization
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7735 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
dtwang line-desktop-mcp Affected: < 1.1.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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