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CVE-2026-33252

nvd nist
Published: Mar 24, 2026Modified: Apr 15, 2026

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6.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Exploitability: 2.8 / Impact: 3.6
Source: NVD

Description

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.

Affected (1)

Lfprojects
1 product
Mcp Go Sdk
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Mcp Go Sdk
Before 1.4.1

Related CWEs

CWE-352
Cross-Site Request Forgery (CSRF)
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

References (2)

Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
PatchVendor Advisory

Timeline

No history available yet.