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CVE-2025-6515

nvd nist
Published: Oct 20, 2025Modified: Jun 17, 2026Deferred

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6.8
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Exploitability: 1.6 / Impact: 5.2
Source: reefs@jfrog.com (Secondary)

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.

Related CWEs

CWE-330
Use of Insufficiently Random Values
The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.

References (1)

Source: reefs@jfrog.com

Timeline

No history available yet.