CVE-2026-55604
Published:July 09, 2026
Updated:August 04, 2026
DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global "SessionStore" accepts caller-supplied "session_id" values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via "deepseek_sessions", then reuse a victim-controlled "session_id" in "deepseek_chat" to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch.
Affected Packages
@arikusi/deepseek-mcp-server (NPM):
Affected version(s) >=1.4.2 <1.7.0Fix Suggestion:
Update to version 1.7.0Related Resources (4)
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Contact UsCVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
EPSS
Base Score:
0.22