CKAN MCP Server is a tool for querying CKAN open data portals. Prior to 0.4.112, the DataStore table UI in src/resources/datastore-table-ui.ts accepts window message events without validating event.origin and sends JSON-RPC messages through postMessage with a wildcard target origin. A frame that can reach the embedded document can inject fabricated fields or records, spoof pending ui/initialize responses, disrupt the MCP UI handshake, or receive outbound messages when the resource is embedded by an untrusted parent. Values are HTML escaped, so the demonstrated content injection is display spoofing rather than script execution, and exploitability depends on the host embedding model. This issue is fixed in version 0.4.112.
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Affected Vendors & Products
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History
Tue, 10 Nov 2026 21:30:00 +0000
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Wed, 04 Nov 2026 02:45:00 +0000
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Ondata
Ondata ckan-mcp-server |
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Ondata
Ondata ckan-mcp-server |
Tue, 03 Nov 2026 20:45:00 +0000
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| Description | CKAN MCP Server is a tool for querying CKAN open data portals. Prior to 0.4.112, the DataStore table UI in src/resources/datastore-table-ui.ts accepts window message events without validating event.origin and sends JSON-RPC messages through postMessage with a wildcard target origin. A frame that can reach the embedded document can inject fabricated fields or records, spoof pending ui/initialize responses, disrupt the MCP UI handshake, or receive outbound messages when the resource is embedded by an untrusted parent. Values are HTML escaped, so the demonstrated content injection is display spoofing rather than script execution, and exploitability depends on the host embedding model. This issue is fixed in version 0.4.112. | |
| Title | CKAN MCP Server: DataStore Table UI resource does not validate postMessage origin (in) and posts to targetOrigin "*" (out) | |
| Weaknesses | CWE-345 CWE-940 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-11-03T20:33:35.548Z
Updated: 2026-11-09T15:48:31.775Z
Reserved: 2026-08-19T22:43:14.890Z
Link: CVE-2026-76894
Updated: 2026-11-09T15:48:25.750Z
Status : Deferred
Published: 2026-11-03T21:17:43.240
Modified: 2026-11-12T20:07:11.090
Link: CVE-2026-76894
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