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

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Summary

CVECVE-2026-34237
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 16:16:32 UTC
Updated2026-04-01 14:24:02 UTC
DescriptionMCP 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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

EPSS: 0.000260000 probability, percentile 0.072270000 (date 2026-04-01)

Problem Types: CWE-942 | CWE-942 CWE-942: Permissive Cross-domain Policy with Untrusted Domains

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Modelcontextprotocol Java-sdk affected < 1.0.1 Not specified
CNA Modelcontextprotocol Java-sdk affected < 1.1.1 Not specified

References

ReferenceSourceLinkTags
github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8... [email protected] github.com
github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/jav... [email protected] github.com
github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/jav... [email protected] github.com
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