CVE-2026-76894
CKAN MCP Server: DataStore Table UI resource does not validate postMessage origin (in) and posts to targetOrigin "*" (out)
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.
Fixes and workarounds
Fix
@aborruso/ckan-mcp-server (npm): GitHub reports patched versions 0.4.112. Check the advisory for the affected release branch.
Source: GitHub GHSA-vqff-r82h-9crcFix
@aborruso/ckan-mcp-server (npm): OSV reports a fixed version 0.4.112. Check the advisory for supported release branches.
Source: OSV GHSA-vqff-r82h-9crcAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| ckan-mcp-server ondata |
< 0.4.112 (affected) | CNA: GitHub_M |
@aborruso/ckan-mcp-server@aborruso/ckan-mcp-server
npm |
< 0.4.112 (affected, GitHub advisory range) | GitHub GHSA-vqff-r82h-9crc |
@aborruso/ckan-mcp-server@aborruso/ckan-mcp-server
npm |
≥ 0; < 0.4.112 (affected, semver); OSV events: introduced 0; fixed 0.4.112Source events (semver)Other versions: unaffected |
OSV GHSA-vqff-r82h-9crc |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 3.1 low |
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N | CNA: GitHub_M |
| 3.1 / 3.1 low |
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N | NVD: [email protected] |
Exploit evidence
- https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-vqff-r82h-9crc
exploit · ADP: CISA-ADP
References
- https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-vqff-r82h-9crcCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/ondata/ckan-mcp-server/commit/3b827af72b228d42aa7b0d7dac5347d16af3f4e5CNA: GitHub_M · x_refsource_MISC
- https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.112CNA: GitHub_M · x_refsource_MISC
- https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-vqff-r82h-9crcADP: CISA-ADP · exploit
- https://github.com/ondata/ckan-mcp-server/commit/3b827af72b228d42aa7b0d7dac5347d16af3f4e5[email protected]
- https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.112[email protected]
- https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-vqff-r82h-9crc[email protected]
- https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-vqff-r82h-9crcGitHub Security Advisories · advisory
- https://github.com/advisories/GHSA-vqff-r82h-9crcOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-vqff-r82h-9crcOSV / GitHub Security Advisories · osv
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