CVE-2026-55604

High

Description

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.

SeverityHigh

CVSS8.6

Exploit probability—

Product@arikusi/deepseek-mcp-server

PublishedJul 9, 2026

First seenJul 9, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

@arikusi/deepseek-mcp-server1.7.0 or later

Affected products

Product	Affected versions	Fixed in
@arikusi/deepseek-mcp-servernpm	1.4.2 ≤ v < 1.7.0	1.7.0

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