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CVE-2025-6515.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSMEDIUM / 6.8CVSS 3.1 · reefs@jfrog.com
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSDeferredModified Oct 08, 2026

Disclosure summary

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-reported weakness categories

CWE-330

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

NIST National Vulnerability Database · NVD-CVE-2025-6515

Open original source · Updated Oct 08, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

Original records & references

PUBLISHED 2025-10-20T13:15:39-04:00
MODIFIED 2026-10-08T18:10:00-04:00
INGESTED 2026-10-10T20:50:35-04:00