Session Hijacking Vulnerability in Oatpp MCP Endpoint by Oatpp

CVE-2025-6515

What is CVE-2025-6515?

The Oatpp MCP endpoint is vulnerable due to its use of a non-unique and cryptographically insecure session ID. This flaw allows attackers with network access to predict and guess session IDs, enabling them to hijack active sessions of legitimate clients. By exploiting this vulnerability, attackers can send malicious responses from the Oatpp MCP server, leading to unauthorized access and potential data breaches. Organizations using Oatpp MCP should implement security measures to mitigate these risks.

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