{"id":"EUVD-2026-38016","revision":null,"records":[{"revision":"ce7a1d94cf3944a5b05057f4656fc9b3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-49357","aliases":[],"title":"Streamable HTTP mode exposes LINE Desktop read/send tools without MCP authentication","description":"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.","state":0,"publishedAt":"2026-06-19T13:11:08.386+00:00","modifiedAt":"2026-06-22T17:15:27.224+00:00","affected":[{"ecosystem":"Vendor product","name":"line-desktop-mcp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"dtwang\",\n                    \"product\": \"line-desktop-mcp\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.1.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.8,"severity":"HIGH"}],"references":["https://github.com/dtwang/line-desktop-mcp/security/advisories/GHSA-4hf8-5mjm-rfgq","https://github.com/dtwang/line-desktop-mcp/commit/680617894981ea93f8f6ceb51ecde7519754d501"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-49357","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-49357","identifiers":["CVE-2026-49357"]},"retained":false,"historicalAffected":[]},{"revision":"dfcd0ed3d78445b98d4c5a7e0ac0e6ed","observedAt":"2026-11-07T11:31:36.979+00:00","statement":{"source":"euvd","id":"EUVD-2026-38016","aliases":["CVE-2026-49357","GHSA-4hf8-5mjm-rfgq"],"title":"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 HT…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":8.8,"severity":null}],"references":["https://github.com/dtwang/line-desktop-mcp/security/advisories/GHSA-4hf8-5mjm-rfgq","https://github.com/dtwang/line-desktop-mcp/commit/680617894981ea93f8f6ceb51ecde7519754d501"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38016","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 19, 2026, 1:11:08 PM","dateUpdated":"Jun 22, 2026, 5:15:27 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-38016","identifiers":["EUVD-2026-38016","CVE-2026-49357","GHSA-4hf8-5mjm-rfgq"]},"retained":false,"historicalAffected":[]},{"revision":"b51e82cf65e646308fc62ff65c2f5a6d","observedAt":"2026-10-27T13:11:53.172+00:00","statement":{"source":"nvd","id":"CVE-2026-49357","aliases":[],"title":"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 HT…","description":"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.","state":0,"publishedAt":"2026-06-19T14:16:23.667+00:00","modifiedAt":"2026-10-26T11:10:00.157+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.8,"severity":"HIGH"}],"references":["https://github.com/dtwang/line-desktop-mcp/commit/680617894981ea93f8f6ceb51ecde7519754d501","https://github.com/dtwang/line-desktop-mcp/security/advisories/GHSA-4hf8-5mjm-rfgq"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49357","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-306","CWE-862"],"productCriteria":[],"sourceDates":{"published":"2026-06-19T14:16:23.667","lastModified":"2026-10-26T11:10:00.157"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-49357","identifiers":["CVE-2026-49357"]},"retained":false,"historicalAffected":[]},{"revision":"9fccb6aeb6c1466280355867f2c7d643","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-4hf8-5mjm-rfgq","aliases":["CVE-2026-49357"],"title":"Streamable HTTP mode exposes LINE Desktop read/send tools without MCP authentication","description":"# Streamable HTTP mode exposes LINE Desktop read/send tools without MCP authentication\n\n## Summary\n\n`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. 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.\n\nThis is High for deployments where the HTTP port is reachable beyond the local host, because the server acts with the user authority of the logged-in LINE Desktop session. It is lower if the listener is strictly firewalled to trusted local clients.\n\n## Affected version\n\nRepository: `dtwang/line-desktop-mcp`\n\nCurrent source checked: `fbed0d2d3048e63f48a356a1267ed8ec5e78f3ae` on `main`, committed 2026-05-14.\n\nPublished npm package checked: `line-desktop-mcp@1.1.1`.\n\n## Source evidence\n\n`README.md` documents Streamable HTTP mode:\n\n```text\nnpx line-desktop-mcp@latest --http-mode --port 3000\n```\n\nThe same README documents MCP endpoints at `/mcp` and explains that this mode is intended for clients such as n8n.\n\n`src/server.js` registers LINE Desktop tools including:\n\n- `get_line_chatroom_history_default`\n- `get_line_chatroom_history_long`\n- `get_line_chatroom_history_short`\n- `send_message_manual`\n- `send_message_auto`\n\nThose tool handlers call into the desktop automation layer: `getChatHistory(...)` and `sendChatMessage(...)`.\n\nIn HTTP mode, `src/server.js` creates an Express app and Streamable HTTP transport, accepts POSTs to `/mcp`, creates sessions, connects the transport to the MCP server, and calls `transport.handleRequest(...)`. I did not find an authentication or bearer-token check before session creation or tool invocation.\n\nThe listener is explicitly network-bound:\n\n```js\napp.listen(port, 0.0.0.0, () => {\n  console.error(`LINE Desktop MCP Server running on Streamable HTTP mode`);\n  console.error(`  Local:   http://127.0.0.1:${port}${endpoint}`);\n  console.error(`  Network: http://0.0.0.0:${port}${endpoint}`);\n});\n```\n\n## Vulnerability chain\n\n1. A user starts the server with `--http-mode --port 3000`.\n2. The server binds on `0.0.0.0:3000`, not only loopback.\n3. A network client reaches `/mcp` and sends the normal MCP initialize request.\n4. The server creates a Streamable HTTP session without authenticating the caller.\n5. The caller can list and invoke LINE Desktop tools.\n6. Tool calls execute through the logged-in LINE Desktop application on the user workstation.\n\n## Impact\n\nAn unauthenticated network client can read LINE chat history through the MCP history tools and can send LINE messages through the send-message tools, including `send_message_auto` when the tool call requests immediate sending. The attacker does not need LINE credentials or a LINE API token; they only need network reachability to the MCP HTTP port.\n\nThe practical impact is disclosure of private LINE conversations and unauthorized messages sent as the logged-in desktop user.\n\n## Suggested fix\n\nRequire authentication before accepting Streamable HTTP MCP sessions or tool calls. For example:\n\n- require a bearer token or local secret when `--http-mode` is used;\n- bind HTTP mode to `127.0.0.1` by default unless the operator explicitly opts into network exposure;\n- refuse to start `0.0.0.0` HTTP mode without authentication;\n- document that `host.docker.internal` / n8n setups must still authenticate to the MCP server.\n\nA defense-in-depth improvement would also keep `send_message_auto` disabled unless explicitly enabled by a server-side flag, because it converts MCP tool access into immediate message sending as the desktop user.","state":0,"publishedAt":"2026-06-26T21:50:49+00:00","modifiedAt":"2026-06-26T22:11:30.924727+00:00","affected":[{"ecosystem":"npm","name":"line-desktop-mcp","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.1.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/dtwang/line-desktop-mcp/security/advisories/GHSA-4hf8-5mjm-rfgq","https://nvd.nist.gov/vuln/detail/CVE-2026-49357","https://github.com/dtwang/line-desktop-mcp/commit/680617894981ea93f8f6ceb51ecde7519754d501","https://github.com/dtwang/line-desktop-mcp"],"sourceUrl":"https://github.com/advisories/GHSA-4hf8-5mjm-rfgq","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4hf8-5mjm-rfgq","identifiers":["GHSA-4hf8-5mjm-rfgq","CVE-2026-49357"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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