Permissive Cross-domain Policy with Untrusted Domains Affecting github.com/nhost/nhost/cli/cmd/mcp/start package, versions <1.41.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMNHOSTNHOSTCLICMDMCPSTART-15922369
- published7 Apr 2026
- disclosed31 Mar 2026
- creditskoveit
Introduced: 31 Mar 2026
CVE-2026-34200 Â (opens in a new tab)How to fix?
Upgrade github.com/nhost/nhost/cli/cmd/mcp/start to version 1.41.0 or higher.
Overview
Affected versions of this package are vulnerable to Permissive Cross-domain Policy with Untrusted Domains via the CLI MCP server. An attacker can gain unauthorized access to privileged tools by issuing cross-origin requests from a malicious website on the same machine, leveraging the developer's locally configured credentials.
Note:
This is only exploitable if the server is explicitly configured to listen on a network port and strict CORS is not enforced, which are both non-default settings.