CVE-2025-6515

MediumCVSS 6.8/10Last modified Oct 8, 2026

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.

Metrics

CVSS 3.1 6.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H

Weakness enumeration

CWE-330

Affected software

No affected versions have been published.

Timeline

Published: Oct 20, 2025
Last modified: Oct 8, 2026
NVD status: Deferred

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