Is this vulnerability remotely exploitable from the public internet?

It can be, if the MCP HTTP endpoint is reachable from the victim's browser and an attacker can entice the victim to visit a malicious website. In many setups this is limited to local or internal access, but the risk depends on network exposure.

Does an attacker need valid credentials or an existing session?

Not necessarily. The issue is most severe in deployments that do not use authentication or that operate in a stateless/sessionless mode, where any accepted HTTP request can trigger MCP actions.

What is the safest general fix pattern?

Combine strict Origin/Referer validation with enforcement of Content-Type: application/json and introduce explicit authentication or authorization controls for MCP endpoints, ensuring only trusted clients can issue requests.

Severity:

HIGH RISK

(7.1)

Cross-Site Request Forgery (CWE-352) in Go MCP SDK Streamable HTTP Transport

CVE-2026-33252

Published:

Mar 23, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Cross-Site Request Forgery (CSRF)

CWE:

CWE-352

Impact:

Cross-Site Request Forgery leading to unauthorized tool invocation

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Request Forgery (CSRF)

CWE:

CWE-352

Impact:

Cross-Site Request Forgery leading to unauthorized tool invocation

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Defensive + offensive security.

From first line of code to a pentest
that knows every line of it.

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Defensive + offensive security.

From first line of code to a pentest
that knows every line of it.

Ask AI for summary of CodeAnt

Cross-Site Request Forgery (CWE-352) in Go MCP SDK Streamable HTTP Transport

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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