CVE-2026-34237 MEDIUM

CVE-2026-34237: MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)

Vendor Modelcontextprotocol
Product java-sdk
Weakness CWE-942
Published March 31, 2026
Last update June 9, 2026
View on NVD All CVEs

CVSS base score

6.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

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.

Key dates

Disclosure timeline

March 31, 2026 CVE published
June 9, 2026 Record updated