CVE-2025-6515

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.

Affected Software

VendorProductVersion RangeStatus
oatppoatpp-mcp0affected

Weaknesses

  • CWE-330: CWE-330 Use of Insufficiently Random Values

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References