{"id":"CVE-2026-49357","summary":"Streamable HTTP mode exposes LINE Desktop read/send tools without MCP authentication","details":"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.","aliases":["GHSA-4hf8-5mjm-rfgq"],"modified":"2026-08-12T03:51:32.372155376Z","published":"2026-06-19T13:11:08.386Z","database_specific":{"cwe_ids":["CWE-306","CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49357.json","unresolved_ranges":[{"extracted_events":[{"fixed":"1.1.2"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49357.json"},{"type":"ADVISORY","url":"https://github.com/dtwang/line-desktop-mcp/security/advisories/GHSA-4hf8-5mjm-rfgq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49357"},{"type":"FIX","url":"https://github.com/dtwang/line-desktop-mcp/commit/680617894981ea93f8f6ceb51ecde7519754d501"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dtwang/line-desktop-mcp","events":[{"introduced":"0"},{"fixed":"680617894981ea93f8f6ceb51ecde7519754d501"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49357.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}