CVE-2026-34237

MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)

Published Mar 31, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Description
MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-hv2w-8mjj-jw22 MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
History
Type Values Removed Values Added
Description MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 1.0.1 and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 1.0.1 and 1.1.1. MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.
Type Values Removed Values Added
First Time appeared Lfprojects
Lfprojects mcp Java Sdk
CPEs cpe:2.3:a:lfprojects:mcp_java_sdk:*:*:*:*:*:*:*:*
cpe:2.3:a:lfprojects:mcp_java_sdk:1.1.0:*:*:*:*:*:*:*
Vendors & Products Lfprojects
Lfprojects mcp Java Sdk
Type Values Removed Values Added
First Time appeared Modelcontextprotocol
Modelcontextprotocol java-sdk
Vendors & Products Modelcontextprotocol
Modelcontextprotocol java-sdk
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 1.0.1 and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 1.0.1 and 1.1.1.
Title MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
Weaknesses CWE-942
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 9, 2026, 6:39 PM
Reserved
Mar 26, 2026, 4:22 PM
Status
Modified
Published
Mar 31, 2026, 4:16 PM
Modified
Jul 24, 2026, 8:10 PM