Is CVE-2026-33252 actively exploited?

No active exploitation of CVE-2026-33252 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33252 be exploited remotely?

Yes. CVE-2026-33252 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33252?

CVE-2026-33252 has a CVSS score of 7.1 (HIGH).

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HIGH

CVE-2026-33252

CWE-352Published: March 24, 2026· Updated: Mar 24, 2026

7.1

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:0.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33252 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.1.