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CVE-2025-6515

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CVE-2025-6515

Published: Oct 20, 2025

Modified: Oct 20, 2025

PUBLISHED

CVSS v3.1

6.8

MEDIUM

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.

VendorProductVersions

oatpp

oatpp-mcp

affected
0

Weaknesses (CWE)

CWE-330

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

References

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