CVE-2025-6515 | THREATINT

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.

PUBLISHED Reserved 2025-06-23 | Published 2025-10-20 | Updated 2025-10-20 | Assigner JFROG

MEDIUM: 6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H

Problem types

CWE-330 Use of Insufficiently Random Values

Product status

Default status

unaffected

Any version

affected

References

research.jfrog.com/...-prompt-hijacking-jfsa-2025-001494691/ third-party-advisory

cve.org (CVE-2025-6515)

nvd.nist.gov (CVE-2025-6515)

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