Cross-site Request Forgery (CSRF) Affecting github.com/modelcontextprotocol/go-sdk/mcp package, versions <1.4.1
Threat Intelligence
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-GITHUBCOMMODELCONTEXTPROTOCOLGOSDKMCP-15701711
- published20 Mar 2026
- disclosed19 Mar 2026
- creditLê Minh Quân
Introduced: 19 Mar 2026
CVE-2026-33252 (opens in a new tab)How to fix?
Upgrade github.com/modelcontextprotocol/go-sdk/mcp to version 1.4.1 or higher.
Overview
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) via the HTTP request handling process. An attacker can execute unauthorized actions by sending crafted cross-site POST requests with a CORS-safelisted Content-Type, bypassing origin and content-type validation.