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

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

https://cvefeed.io/rssfeed/latest.atom / Mon, 10/20/2025 - 23:44
CVE ID : CVE-2025-6515
Published : Oct. 20, 2025, 5:15 p.m. | 3 hours, 11 minutes ago
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.
Severity: 6.8 | MEDIUM
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Kenya Education Network CERT(KENET-CERT) is a Cybersecurity Emergency Response Team and Co-ordination Center operated by the National Research and Education Network of Kenya. KENET-CERT coordination center promotes awareness on cybersecurity incidences as well as coordinates and assists member institutions in responding effectively to cyber security threats and incidences. KENET-CERT works closely with Kenya's National CIRT coordination center (CIRT/CC) as a sector CIRT for the academic institutions. KENET promotes use of ICT in Teaching, Learning and Research in Higher Education Institutions in Kenya. KENET aims to interconnect all the Universities, Tertiary and Research Institutions in Kenya by setting up a cost effective and sustainable private network with high speed access to the global Internet. KENET also facilitates electronic communication among students and faculties in member institutions, share learning and teaching resources by collaboration in Research and Development of Educational content.