VDB
CVE-2026-34237
CVE-2026-34237
PUBLISHED
CVSS 6.099999904632568 MEDIUM
MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
EPSS 0.01% · 2.0th percentile
Risk Scores
CVSS v3.1
6.099999904632568
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS Score
0.01%
2.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| modelcontextprotocol | java-sdk | < 1.0.1, < 1.1.1 |
| Maven | io.modelcontextprotocol.sdk:mcp-core | 1.1.0, 0, 1.1.0 |
| lfprojects | mcp_java_sdk | 1.1.0, 0 |
Timeline
- Mar 30, 2026 CVE Published
- Mar 31, 2026 CVE Updated
- Mar 31, 2026 Security Advisory
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score
- May 26, 2026 EPSS Score
References
- https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22 url
- https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java#L289 url
- https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java#L525 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-34237 advisory
- https://cheatsheetseries.owasp.org/cheatsheets/HTTP_Headers_Cheat_Sheet.html#access-control-allow-origin url
- https://github.com/modelcontextprotocol/java-sdk package