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Low, CVSS 3.1amended

ckan-mcp-server: DataStore Table UI resource does not validate postMessage origin (in) and posts to targetOrigin "*" (out)

CVE-2026-76894GHSA-vqff-r82h-9crc

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@aborruso/ckan-mcp-server 0.4.112), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
3.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary The MCP Apps UI resource (an interactive DataStore table rendered in the host's webview/iframe) communicates with its parent via postMessage. Its inbound message listener performs no event.origin validation, and its outbound messages are sent with target origin ''. Any window/frame able to reach the document can inject data into the table and interfere with the MCP UI handshake, and the UI's own JSON-RPC messages are broadcast without an origin restriction. Affected code src/resources/datastore-table-ui.ts (inline HTML): There is no allowlist of accepted origins for inbound messages and no fixed target origin for outbound messages. Impact - Content spoofing. A frame that can postMessage to the UI can supply arbitrary fields/records, causing the table to render fabricated rows and links (e.g. a phishing linkurl) that appear to come from the queried portal. (Values are HTML-escaped, so this is display spoofing, not script injection — no XSS.) - Handshake/UX interference.…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-vqff-r82h-9crc

  2. Revision 2 · amended ·

    Amended from osv record GHSA-vqff-r82h-9crc

  3. Revision 1 · created ·

    Published from ghsa record GHSA-vqff-r82h-9crc

Agent brief

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# Patch Next advisory brief: CVE-2026-76894

Advisory: ckan-mcp-server: DataStore Table UI resource does not validate postMessage origin (in) and posts to targetOrigin "*" (out)
IDs: CVE-2026-76894, GHSA-vqff-r82h-9crc
Record: https://patchnext.com/advisories/cve-2026-76894 (revision 3, source checked 26 Oct 2026, 13:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @aborruso/ckan-mcp-server 0.4.112. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @aborruso/ckan-mcp-server: affected < 0.4.112; fixed in 0.4.112

## Suggested inspection (read-only)
- `npm ls @aborruso/ckan-mcp-server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @aborruso/ckan-mcp-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-vqff-r82h-9crc (GitHub-reviewed advisory GHSA-vqff-r82h-9crc lists affected ranges: npm @aborruso/ckan-mcp-server >=0 <0.4.112)
- Verified: https://osv.dev/vulnerability/GHSA-vqff-r82h-9crc (OSV record GHSA-vqff-r82h-9crc lists affected ranges: npm @aborruso/ckan-mcp-server >=0 <0.4.112 (fixed))

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