Medium severity6.8NVD Advisory· Published Oct 20, 2025· Updated Apr 15, 2026
CVE-2025-6515
CVE-2025-6515
Description
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.
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Affected products
2Patches
Vulnerability mechanics
References
1News mentions
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