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CVE-2025-6515— Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers

Quick assessment

Affected
oatpp oatpp-mcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

oatpp-mcp是Oat++开源的一个模型上下文协议的实现。 oatpp-mcp存在安全特征问题漏洞，该漏洞源于MCP SSE端点返回实例指针作为会话ID，可能导致会话劫持攻击。

CVSS 6.8 · Medium EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2025-6515

Vulnerability Information
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Vulnerability Title
Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
Source: CVE Program / CVE List V5
Vulnerability Title
oatpp-mcp 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
oatpp-mcp是Oat++开源的一个模型上下文协议的实现。 oatpp-mcp存在安全特征问题漏洞，该漏洞源于MCP SSE端点返回实例指针作为会话ID，可能导致会话劫持攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
oatpp oatpp-mcp 0 -

II. Public POCs for CVE-2025-6515

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III. Intelligence Information for CVE-2025-6515

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IV. Related Vulnerabilities

Same vendor: oatpp
Same weakness: CWE-330

V. Comments for CVE-2025-6515

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