MEDIUMMaven →
MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
Affected packages
- io.modelcontextprotocol.sdk:mcp-core— 1.0.0 → 1.0.1
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22
- https://nvd.nist.gov/vuln/detail/CVE-2026-34237
- https://cheatsheetseries.owasp.org/cheatsheets/HTTP_Headers_Cheat_Sheet.html#access-control-allow-origin
- https://github.com/modelcontextprotocol/java-sdk
- 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
Structured record: https://osv.dev/vulnerability/GHSA-hv2w-8mjj-jw22
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