Session Hijacking Vulnerability in Oatpp MCP Endpoint by Oatpp
CVE-2025-6515

6.8MEDIUM

Key Information:

Vendor

Oatpp

Status
Oatpp-mcp
Vendor
CVE Published:
20 October 2025

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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Deploy the Patch

Affected Version(s)

oatpp-mcp 0

References

https://research.jfrog.com/vulnerabilities/oatpp-mcp-prom...
third-party-advisory

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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