🛡️ CVE-2025-6515
🟡 CVSS 6.8 — Medium ✅ No Known Exploit CWE-330 NVD
6.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 6.8
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
CWE CWE-330
Public Exploit ✅ No
Source NVD
Published 2025-10-20
Updated 2026-06-02
Modified 2026-04-15
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown

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