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CVE-2025-6515

6.8 medium SSVC exploitation: none Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 6.8NVD modified 2026-10-08 22:10

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1