## ckan-mcp-server: DataStore Table UI resource does not validate postMessage origin (in) and posts to targetOrigin "*" (out)

- 種別: advisory
- 重大度: low
- 関連技術: nodejs
- CVE: CVE-2026-76894
- 公開日時: 2026-10-16T19:23:48.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-vqff-r82h-9crc)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-vqff-r82h-9crc

影響: npm:@aborruso/ckan-mcp-server < 0.4.112 → 0.4.112
Summary The MCP Apps UI resource (an interactive DataStore table rendered in the host's webview/iframe) communicates with its parent via postMessage. Its inbound message listener performs no event.origin validation, and its outbound messages are sent with target origin ''. Any window/frame able to reach the document can inject data into the table and interfere with the MCP UI handshake, and the UI's own JSON-RPC messages are broadcast without an origin restriction. Affected code src/resources/d…