CVE-2026-73845: CKAN MCP Server: MQA server allowlist bypass via unanchored regex (`isValidMqaServer`)

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-14 · updated 2026-09-18
Weakness: CWE-20

Description

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.

Affected products

ondata ckan-mcp-server: before 0.4.112

References

https://github.com/ondata/ckan-mcp-server/commit/8e1522f9bbfa1f3b21550f17887f60f133e24151
https://github.com/ondata/ckan-mcp-server/releases/tag/v0.4.112
https://github.com/ondata/ckan-mcp-server/security/advisories/GHSA-83x6-42hr-jc76

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