MCP Java SDK — Vulnerability (CVE-2026-34237)
Date: 2026-03
Affected: lfprojects/mcp_java_sdk
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-34237
CWE: CWE-942
CVSS: 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):