Vulnerability record · CVE-2026-33252 · published 24 March 2026

CVE-2026-33252: Lfprojects mcp go sdk cross-site request forgery vulnerability

Lfprojects · Mcp Go Sdk

The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.

6.5 CVSS 3.1 Medium EPSS 0.21% · top 89.7% CWE-352 · Cross-site request forgery

6.5CVSS 3.1 base score

0.21%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Mcp Go Sdk Lfprojects

References

Link	Tags
https://github.com/modelcontextprotocol/go-sdk/commit/a433a831d6e5d5ac3b9e625a8095aa8eaa040dfc	Patch
https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-89xv-2j6f-qhc8	PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-33252), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.