Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
modelcontextprotocol java-sdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP Java SDK是Model Context Protocol开源的一个用于Java应用集成AI模型与工具的标准协议SDK。 MCP Java SDK 1.0.1之前版本和1.1.1之前版本存在安全漏洞，该漏洞源于存在硬编码的通配符CORS。

CVSS 6.1 · Medium EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
modelcontextprotocol java-sdk >= 1.0.0, < 1.0.1 affected
>= 1.1.0, < 1.1.1 affected
< 0.18.3 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-34237

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度许可的跨域白名单
Source: CVE Program / CVE List V5
Vulnerability Title
MCP Java SDK 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Java SDK是Model Context Protocol开源的一个用于Java应用集成AI模型与工具的标准协议SDK。 MCP Java SDK 1.0.1之前版本和1.1.1之前版本存在安全漏洞，该漏洞源于存在硬编码的通配符CORS。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
modelcontextprotocol java-sdk >= 1.0.0, < 1.0.1 -

II. Public POCs for CVE-2026-34237

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-34237

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-34237 (1)

Other References for CVE-2026-34237 (1)

IV. Related Vulnerabilities

Same product: java-sdk
Same vendor: modelcontextprotocol
Same weakness: CWE-942

V. Comments for CVE-2026-34237

No comments yet

Leave a comment