{"id":"CVE-2025-6515","state":"PUBLISHED","title":"Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers","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.","publishedAt":"2025-10-20T16:13:43.527Z","updatedAt":"2025-10-20T16:33:47.787Z","severity":{"score":6.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H","source":"JFROG"},"assigner":"JFROG","products":["oatpp oatpp-mcp"],"affected":[{"vendor":"oatpp","product":"oatpp-mcp","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","versionType":"cpe"}]}],"references":["https://research.jfrog.com/vulnerabilities/oatpp-mcp-prompt-hijacking-jfsa-2025-001494691/"],"weaknesses":["CWE-330"],"ingestedAt":"2026-10-29T20:10:04.440Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/6xxx/CVE-2025-6515.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-6515","state":"PUBLISHED","datePublished":"2025-10-20T16:13:43.527Z","dateUpdated":"2025-10-20T16:33:47.787Z","assignerShortName":"JFROG","assignerOrgId":"48a46f29-ae42-4e1d-90dd-c1676c1e5e6d","dateReserved":"2025-06-23T10:56:07.978Z"},"containers":{"cna":{"title":"Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"oatpp","product":"oatpp-mcp","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","versionType":"cpe"}]}],"references":[{"url":"https://research.jfrog.com/vulnerabilities/oatpp-mcp-prompt-hijacking-jfsa-2025-001494691/","tags":["third-party-advisory"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-330","description":"CWE-330 Use of Insufficiently Random Values","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"JFROG","orgId":"48a46f29-ae42-4e1d-90dd-c1676c1e5e6d","dateUpdated":"2025-10-20T16:13:43.527Z"},"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-10-20T16:33:42.234883Z","id":"CVE-2025-6515","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-20T16:33:47.787Z"}}]}}}