CVE-2026-34237
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| modelcontextprotocol | java-sdk | >= 1.0.0, < 1.0.1 | affected |
| modelcontextprotocol | java-sdk | >= 1.1.0, < 1.1.1 | affected |
| modelcontextprotocol | java-sdk | < 0.18.3 | affected |
Weaknesses
- CWE-942: CWE-942: Permissive Cross-domain Policy with Untrusted Domains
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22
- https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java#L289
- https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java#L525
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