CVSS 3.1
3.1 lowCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:NCVE-2026-76894
Low (3.1). EPSS 0.2% estimated probability of exploitation activity in the next 30 days. Fixed in @aborruso/ckan-mcp-server 0.4.112.
On this page
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.
Severity
- EPSS
- 0.2% estimated probability of exploitation activity in the next 30 days; 9th percentile. Scored 2026-11-04. A forecast for this CVE across the internet, not for your own systems.
- CWEs
- CWE-345 Insufficient Verification of Data Authenticity
CWE-940 Improper Verification of Source of a Communication Channel - Published
- Record from
- the NVD, synced
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Explain CVE-2026-76894 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-76894?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-76894?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-76894 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| ondata ckan-mcp-server | < 0.4.112 |
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-vqff-r82h-9crc | npm | @aborruso/ckan-mcp-server | <0.4.112 | 0.4.112 |
Attack patterns (CAPEC)
- CAPEC-500 WebView Injection
- CAPEC-594 Traffic Injection
- CAPEC-595 Connection Reset
- CAPEC-596 TCP RST Injection
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-345 (12).