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URL: https://nvd.nist.gov/vuln/detail/CVE-2025-6515

⇱ NVD - CVE-2025-6515

  1. Vulnerabilities

CVE-2025-6515 Detail

Not Scheduled

This CVE record is not being prioritized for NVD enrichment efforts due to resource or other concerns.

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://research.jfrog.com/vulnerabilities/oatpp-mcp-prompt-hijacking-jfsa-2025-001494691/ JFrog

Weakness Enumeration

CWE-ID CWE Name Source
CWE-330 Use of Insufficiently Random Values JFrog  

Change History

3 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 6:02:03 AM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2025-10-20T16:33:42.234883Z","id":"CVE-2025-6515","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by JFrog 6/17/2026 6:02:03 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"oatpp","product":"oatpp-mcp","defaultStatus":"unaffected","versions":[{"version":"0","versionType":"cpe","status":"affected"}]}]

New CVE Received from JFrog 10/20/2025 1:15:39 PM

Action Type Old Value New Value
Added 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.
Added CVSS V3.1 
AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Added CWE 
CWE-330
Added Reference 
https://research.jfrog.com/vulnerabilities/oatpp-mcp-prompt-hijacking-jfsa-2025-001494691/

Quick Info

CVE Dictionary Entry:
CVE-2025-6515
NVD Published Date:
10/20/2025
NVD Last Modified:
06/17/2026
Source:
JFrog