AUGUST 4, 2026
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Case File

CVE-2025-6515

MEDIUM · CVSS 6.8 EPSS 0.37%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2025-10-20 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 6.8. See the original NVD description below for full technical details.

CVE
CVE-2025-6515
Severity
MEDIUM
CVSS
6.8
EPSS
0.37%

Original NVD 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.