CVE-2025-6515 (GCVE-0-2025-6515)
Vulnerability from cvelistv5
Published
2025-10-20 16:13
Modified
2025-10-20 16:33
Severity ?
6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
CWE
  • CWE-330 - Use of Insufficiently Random Values
Summary
The MCP SSE endpoint in oatpp-mcp returns an instance pointer as the session ID, which is not unique nor cryptographically secure. This allows network attackers with access to the oatpp-mcp server to guess future session IDs and hijack legitimate client MCP sessions, returning malicious responses from the oatpp-mcp server.
References
Impacted products
Vendor Product Version
oatpp oatpp-mcp Version: 0
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