CVE-2026-76894
LowCVSS 3.1Summary
CKAN MCP Server 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.
Risk Assessment
This may lead to spoofing of data displayed to the user or disruption of communication, potentially misleading and affecting data integrity. Organizations using CKAN MCP Server in embedding contexts by untrusted sites are exposed to spoofing attacks.
Recommendation
Update CKAN MCP Server to version 0.4.112 or later. Avoid embedding the resource in untrusted contexts and verify message origins.
Other vulnerabilities in CKAN MCP Server
See all- CVE-2026-61612Medium
CKAN MCP Server is a tool for querying CKAN open data portals. Prior to version 0.4.108, the SSRF guard `validateServerUrl` (added for CVE-2026-33060, extended for CVE-2026-53509) validates only the hostname string and never resolves DNS. Any caller-supplied `server_url` whose hostname *resolves* to an internal address passes the guard, so the server issues requests to loopback and cloud metadata (`169.254.169.254`). This is a third bypass of the same guard, and it reaches IMDS — strictly more than CVE-2026-53509, which only reached loopback. Version 0.4.108 contains an updated fix.
- CVE-2026-53509Medium
CKAN MCP Server before version 0.4.106 has an SSRF vulnerability that allows bypassing the IP address filter using hostname aliases such as ip6-localhost, which are not equal to localhost and are not dotted IPv4 or bracketed IPv6 literals. A remote caller can force the server to connect to local or private addresses.
- CVE-2026-73846Medium
CKAN MCP Server before 0.4.112 contains a vulnerability in canonicalizeParams in src/utils/cache.ts that serializes request parameters with unescaped ampersand, equals-sign, and vertical-bar delimiters, allowing different logical parameter sets used by buildCacheKey to collide. An attacker can prime a shared cache with a response for a victim's distinct query.
- CVE-2026-73845Medium
CKAN MCP Server before 0.4.112 contains a vulnerability in the ckan_get_mqa_quality and ckan_get_mqa_quality_details tools in src/tools/quality.ts. The isValidMqaServer function validates the server_url parameter with a prefix-only regular expression for dati.gov.it, allowing suffix-host and URL-userinfo values to target an attacker-controlled host and return a spoofed response.
- CVE-2026-73844Low
CKAN MCP Server is a tool for querying CKAN open data portals. Prior to 0.4.112, error paths reflect raw upstream response bodies and internal exception messages back to the caller instead of a sanitized, generic message. When the server is pointed at (or redirected/SSRF'd to) a host that returns a non-CKAN response, or when an internal exception occurs, the caller receives verbatim upstream content and internal detail (hostnames, internal IPs, DB errors, stack fragments). This vulnerability is fixed in 0.4.112.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS