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    CVE-2026-33252

    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.

    Published:Mar 23, 2026
    Last Modified:Apr 15, 2026
    EPS:Mar 23, 2026
    EPSS Score:0.00007
    CVSS Score:7.1

    Affected Products

    Vendor
    Lfprojects
    Product
    Mcp Go Sdk
    Vendor
    Modelcontextprotocol
    Product
    Go-sdk

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High