Cross-site Request Forgery (CSRF) Affecting gitlab-workhorse-ce-18.8 package, versions <18.8.7-r1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.21% (11th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-GITLABWORKHORSECE188-15801574
  • published28 Mar 2026
  • disclosed24 Mar 2026

Introduced: 24 Mar 2026

CVE-2026-33252  (opens in a new tab)
CWE-352  (opens in a new tab)

How to fix?

Upgrade Chainguard gitlab-workhorse-ce-18.8 to version 18.8.7-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gitlab-workhorse-ce-18.8 package and not the gitlab-workhorse-ce-18.8 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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 Base Scores

version 3.1