7.1

CVE-2026-33252: lfprojects mcp_go_sdk Cross-Site Request Forgery (CSRF)

CVSS: 7.1v3.1HighAnalyzed
AliasesCGA-29w8-r4j5-qq6gCGA-462m-82rx-2wm4CGA-464c-q679-7c79
Published 23-03-2026Last modified 24-03-2026
Open JSON

Vulnerability summary

CVE-2026-33252 is a high (CVSS 7.1) Cross-Site Request Forgery (CSRF) vulnerability in lfprojects mcp_go_sdk. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.8% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1135-1CGA-XFC9-VHJG-VR43

Timeline

  1. 23-03-2026
    PublishedVulnerability first disclosed.
  2. 24-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

+0.04 pp

From 0.18% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard30 products
  • datadog-cluster-agent-7.75All versions (No fix recorded)
  • datadog-cluster-agent-7.76< 7.76.3-r4
  • datadog-cluster-agent-fips-7.75All versions (No fix recorded)
  • datadog-cluster-agent-fips-7.76< 7.76.3-r4
  • ferretdb< 2.7.0-r10
Wolfi11 products
  • datadog-cluster-agent-7.75All versions (No fix recorded)
  • datadog-cluster-agent-7.76< 7.76.3-r4
  • ferretdb< 2.7.0-r10
  • glab< 1.90.0-r0
  • jaeger-2-all-in-one< 2.16.0-r3
Github.com/modelcontextprotocol1 product
  • go-sdk< 1.4.1
Lfprojects1 product
Modelcontextprotocol1 product

5 vendors · 44 products

References

5 links