fkie_cve-2026-73845

CKAN MCP Server is a tool for querying CKAN open data portals. Prior to 0.4.112, the ckan_get_mqa_quality and ckan_get_mqa_quality_details tools in src/tools/quality.ts use isValidMqaServer to validate 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. This issue is fixed in version 0.4.112.

GHSA-83x6-42hr-jc76 — CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`)

Affected: npm: @aborruso/ckan-mcp-server

## Summary

The `ckan_get_mqa_quality` and `ckan_get_mqa_quality_details` tools restrict their `server_url` argument to `dati.gov.it` via a regular expression. The regex is anchored only at the start and places no boundary after the host, so any URL whose host merely **begins with** `dati.gov.it` — or that uses `dati.gov.it` as URL *userinfo* before an `@` — passes validation while actually targeting an attacker-controlled host.

## Affected code

```js // src/tools/quality.ts const ALLOWED_SERVER_PATTERNS = [ /^https?:\/\/(www\.)?dati\.gov\.it/i // <-- no end anchor / host boundary ]; export function isValidMqaServer(serverUrl: string): boolean { return ALLOWED_SERVER_PATTERNS.some(pattern => pattern.test(serverUrl)); } ```

All of the following return `true`:

| URL | Real host | |-----|-----------| | `https://dati.gov.it.attacker.com/x` | `dati.gov.it.attacker.com` (attacker) | | `http://dati.gov.it.evil.example/api` | `dati.gov.it.evil.example` (attacker) | | `https://dati.gov.it@attacker.com/x` | `attacker.com` (userinfo trick) |

After passing this check, `server_url` flows into `getMqaQuality`/`getMqaQualityDetails`, which call `makeCkanRequest(serverUrl, "package_show", { id })`. The server therefore issues a request to the attacker-controlled host and returns its (parsed) response to the caller.

## Impact

- The intended "dati.gov.it only" trust boundary for the MQA tools is defeated; they can be driven against arbitrary external hosts. - The attacker ho…

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fkie_cve-2026-73845

GHSA-83x6-42hr-jc76 — CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`)