Vulnerability record/PUBLISHED/Published Nov 3, 2026 20:33:35 UTC

CVE-2026-76894

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.

Base score3.1/ 10

SeverityLowCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityLow

Attack vectorNetworkAV

Attack complexityHighAC

Privileges requiredNonePR

User interactionRequiredUI

ScopeUnchangedS

Confidentiality impactLowC

Integrity impactNoneI

Availability impactNoneA

CVSS vector stringCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering AuthorityGitHub_M

Last updatedNov 9, 2026 15:48:31 UTC

PublishedNov 3, 2026 20:33:35 UTC

ReservedAug 19, 2026 22:43:14 UTC