CVE-2026-76894
LOW
INFO
Priority: 0.01
BB Relevance:
46/100
Published: 2026-11-03
Modified: 2026-11-12
First seen: 2026-11-03
Status: active
Attack Surface
Network
No Auth
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
Required
S:
Unchanged
C:
Low
I:
None
A:
None
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.
Weakness Classification (2)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| ondata | ckan-mcp-server | < 0.4.112 |
| ondata | ckan-mcp-server | < 0.4.112 |
References & Advisories (3)
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM