CVE-2025-6515 — Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers

CVE-2025-6515

Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
oatpp / oatpp-mcp	affected 0

CWE

CWE-330

References

https://research.jfrog.com/vulnerabilities/oatpp-mcp-prompt-hijacking-jfsa-2025-001494691/

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.